user70509: This is a follow up from a previous question. I have one Nano working perfectly (I think) (Nano A) and another one (Nano B) which seems to be working but has no bootloader. So I am trying to use Nano-A as an ISP programmer to burn the bootloader into Nano-B. I am pretty confident with my hardware and Arduino IDE setup. See previous question for the details; Problems uploading with a new Nano
I have pasted below two screen sessions. The first shows the Arduino IDE Log when I (unsuccesfully) try to run "Burn Bootloader" - IT almost works! (but not quite). - So I beleive that there is not too much wrong with my setup.
The second session is me using running avrdude in "terminal" mode from a Windows command prompt. I have used individual "send" commands to send the ISP instructions required to programme a single word into bootloader flash memory and this all seems to work OK. So I don't understand why avrdude is not working when invoked by the IDE.
Arduino IDE Log (lengthy)
C:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude -CC:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf -v -patmega328p -cstk500v1 -PCOM8 -b19200 -e -Ulock:w:0x3F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xDA:m -Ulfuse:w:0xFF:m 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf"

         Using Port                    : COM8
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500
         Description     : Atmel STK500 Version 1.x firmware
         Hardware Version: 2
         Firmware Version: 1.18
         Topcard         : Unknown
         Vtarget         : 0.0 V
         Varef           : 0.0 V
         Oscillator      : Off
         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.11s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: erasing chip
avrdude: reading input file "0x3F"
avrdude: writing lock (1 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1 bytes of lock written
avrdude: verifying lock memory against 0x3F:
avrdude: load data lock data from input file 0x3F:
avrdude: input file 0x3F contains 1 bytes
avrdude: reading on-chip lock data:

Reading | ################################################## | 100% 0.04s

avrdude: verifying ...
avrdude: 1 bytes of lock verified
avrdude: reading input file "0xFD"
avrdude: writing efuse (1 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0xFD:
avrdude: load data efuse data from input file 0xFD:
avrdude: input file 0xFD contains 1 bytes
avrdude: reading on-chip efuse data:

Reading | ################################################## | 100% 0.04s

avrdude: verifying ...
avrdude: 1 bytes of efuse verified
avrdude: reading input file "0xDA"
avrdude: writing hfuse (1 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1 bytes of hfuse written
avrdude: verifying hfuse memory against 0xDA:
avrdude: load data hfuse data from input file 0xDA:
avrdude: input file 0xDA contains 1 bytes
avrdude: reading on-chip hfuse data:

Reading | ################################################## | 100% 0.04s

avrdude: verifying ...
avrdude: 1 bytes of hfuse verified
avrdude: reading input file "0xFF"
avrdude: writing lfuse (1 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1 bytes of lfuse written
avrdude: verifying lfuse memory against 0xFF:
avrdude: load data lfuse data from input file 0xFF:
avrdude: input file 0xFF contains 1 bytes
avrdude: reading on-chip lfuse data:

Reading | ################################################## | 100% 0.04s

avrdude: verifying ...
avrdude: 1 bytes of lfuse verified

avrdude done.  Thank you.


C:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude -CC:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf -v -patmega328p -cstk500v1 -PCOM8 -b19200 -Uflash:w:C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:i -Ulock:w:0x0F:m 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf"

         Using Port                    : COM8
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500
         Description     : Atmel STK500 Version 1.x firmware
         Hardware Version: 2
         Firmware Version: 1.18
         Topcard         : Unknown
         Vtarget         : 0.0 V
         Varef           : 0.0 V
         Oscillator      : Off
         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.11s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex"
avrdude: writing flash (32768 bytes):

Writing | ################################################## | 100% 0.00s

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_cmd(): programmer is out of sync
avrdude: stk500_cmd(): programmer is out of sync
avrdude: 32768 bytes of flash written
avrdude: verifying flash memory against C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:
avrdude: load data flash data from input file C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:
avrdude: input file C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex contains 32768 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.00s

avrdude: loadaddr(): (b) protocol error, expect=0x14, resp=0xc0

avrdude: stk500_paged_load(): (a) protocol error, expect=0x14, resp=0x10
avrdude: stk500_cmd(): protocol error
avr_read(): error reading address 0x7e00
    read operation not supported for memory "flash"
avrdude: failed to read all of flash memory, rc=-2
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0xd1

avrdude done.  Thank you.

Error while burning bootloader.

avrdude session (short)

Note that when writing to the bootloader flash, using the "send" instruction, you have to supply the address as a "word" - i.e. 16bit address - hence 0x3C00. When usning the "read" instruction, the address is a "byte" (8 bit) address, hence 0x7800 - this is the same address.
Update: I have now managed to upload my original sketch to the application area of flash on this Nano using the "Sketch->upload using programmer" menu option of the Arduino IDE. So I do now have a useable Nano but I have still not solved my original problem i.e. this  Nano still does not have a bootloader. I would like to fix this problem becaue I am sure that I will want to update/modify my app int the future. So there is now an ancilliary question - i.e. is it possible to burn a  bootloader without erasing a pre-existing application? - Answer, I think is no because maybe you have to do a chip erase before writing to the bootloader area?

user70509: Yay! - I now have a fully working Nano with new bootloader and application loaded using this.
I have done so much that I'm not sure what the original problem was but the final change was modifying the "programmers.txt" file such that "Arduino as ISP" entry was changed as follows;
Original line;
arduinoasisp.protocol=stk500v1

Changed to;
arduinoasisp.protocol=arduino

I did this because I noticed that the menu option "Upload using programmer" (which worked) invoked avrdude with the parameter "-c arduino" whereas the "burn bootloader" option used "-c stk500v1" (which was not working).
I can't pretened that I fully understand but I'm happy that this now works and that I have now learnt enough to know where to start looking if I get similar problems in the future.
I should also add that I would never have got here without the help of @timemage - who has helped a lot - many many thanks

70509: <p>This is a follow up from a previous question. I have one Nano working perfectly (I think) (Nano A) and another one (Nano B) which seems to be working but has no bootloader. So I am trying to use Nano-A as an ISP programmer to burn the bootloader into Nano-B. I am pretty confident with my hardware and Arduino IDE setup. See previous question for the details; <a href="https://arduino.stackexchange.com/questions/79743/problems-uploading-with-a-new-nano">Problems uploading with a new Nano</a></p>
<p>I have pasted below two screen sessions. The first shows the Arduino IDE Log when I (unsuccesfully) try to run &quot;Burn Bootloader&quot; - IT <em>almost</em> works! (but not quite). - So I beleive that there is not too much wrong with my setup.</p>
<p>The second session is me using running avrdude in &quot;terminal&quot; mode from a Windows command prompt. I have used individual &quot;send&quot; commands to send the ISP instructions required to programme a single word into bootloader flash memory and this all seems to work OK. So I don't understand why avrdude is not working when invoked by the IDE.</p>
<p><strong>Arduino IDE Log (lengthy)</strong></p>
<pre><code>C:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude -CC:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf -v -patmega328p -cstk500v1 -PCOM8 -b19200 -e -Ulock:w:0x3F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xDA:m -Ulfuse:w:0xFF:m 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is &quot;C:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf&quot;

         Using Port                    : COM8
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500
         Description     : Atmel STK500 Version 1.x firmware
         Hardware Version: 2
         Firmware Version: 1.18
         Topcard         : Unknown
         Vtarget         : 0.0 V
         Varef           : 0.0 V
         Oscillator      : Off
         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.11s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: erasing chip
avrdude: reading input file &quot;0x3F&quot;
avrdude: writing lock (1 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1 bytes of lock written
avrdude: verifying lock memory against 0x3F:
avrdude: load data lock data from input file 0x3F:
avrdude: input file 0x3F contains 1 bytes
avrdude: reading on-chip lock data:

Reading | ################################################## | 100% 0.04s

avrdude: verifying ...
avrdude: 1 bytes of lock verified
avrdude: reading input file &quot;0xFD&quot;
avrdude: writing efuse (1 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0xFD:
avrdude: load data efuse data from input file 0xFD:
avrdude: input file 0xFD contains 1 bytes
avrdude: reading on-chip efuse data:

Reading | ################################################## | 100% 0.04s

avrdude: verifying ...
avrdude: 1 bytes of efuse verified
avrdude: reading input file &quot;0xDA&quot;
avrdude: writing hfuse (1 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1 bytes of hfuse written
avrdude: verifying hfuse memory against 0xDA:
avrdude: load data hfuse data from input file 0xDA:
avrdude: input file 0xDA contains 1 bytes
avrdude: reading on-chip hfuse data:

Reading | ################################################## | 100% 0.04s

avrdude: verifying ...
avrdude: 1 bytes of hfuse verified
avrdude: reading input file &quot;0xFF&quot;
avrdude: writing lfuse (1 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1 bytes of lfuse written
avrdude: verifying lfuse memory against 0xFF:
avrdude: load data lfuse data from input file 0xFF:
avrdude: input file 0xFF contains 1 bytes
avrdude: reading on-chip lfuse data:

Reading | ################################################## | 100% 0.04s

avrdude: verifying ...
avrdude: 1 bytes of lfuse verified

avrdude done.  Thank you.


C:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude -CC:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf -v -patmega328p -cstk500v1 -PCOM8 -b19200 -Uflash:w:C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:i -Ulock:w:0x0F:m 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is &quot;C:\Users\--\Documents\ArduinoData\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf&quot;

         Using Port                    : COM8
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500
         Description     : Atmel STK500 Version 1.x firmware
         Hardware Version: 2
         Firmware Version: 1.18
         Topcard         : Unknown
         Vtarget         : 0.0 V
         Varef           : 0.0 V
         Oscillator      : Off
         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.11s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: NOTE: &quot;flash&quot; memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file &quot;C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex&quot;
avrdude: writing flash (32768 bytes):

Writing | ################################################## | 100% 0.00s

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_cmd(): programmer is out of sync
avrdude: stk500_cmd(): programmer is out of sync
avrdude: 32768 bytes of flash written
avrdude: verifying flash memory against C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:
avrdude: load data flash data from input file C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:
avrdude: input file C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.42.0_x86__mdqgnx93n4wtt\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex contains 32768 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.00s

avrdude: loadaddr(): (b) protocol error, expect=0x14, resp=0xc0

avrdude: stk500_paged_load(): (a) protocol error, expect=0x14, resp=0x10
avrdude: stk500_cmd(): protocol error
avr_read(): error reading address 0x7e00
    read operation not supported for memory &quot;flash&quot;
avrdude: failed to read all of flash memory, rc=-2
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0xd1

avrdude done.  Thank you.

Error while burning bootloader.
</code></pre>
<p><strong>avrdude session (short)</strong></p>
<p><a href="https://i.stack.imgur.com/mLhdv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mLhdv.png" alt="enter image description here" /></a></p>
<p>Note that when writing to the bootloader flash, using the &quot;send&quot; instruction, you have to supply the address as a &quot;word&quot; - i.e. 16bit address - hence 0x3C00. When usning the &quot;read&quot; instruction, the address is a &quot;byte&quot; (8 bit) address, hence 0x7800 - this is the same address.</p>
<p>Update: I have now managed to upload my original sketch to the application area of flash on this Nano using the &quot;Sketch-&gt;upload using programmer&quot; menu option of the Arduino IDE. So I do now have a useable Nano but I have still not solved my original problem i.e. this  Nano still does not have a bootloader. I would like to fix this problem becaue I am sure that I will want to update/modify my app int the future. So there is now an ancilliary question - i.e. is it possible to burn a  bootloader without erasing a pre-existing application? - Answer, I think is no because maybe you have to do a chip erase before writing to the bootloader area?</p>
 70509: <p>Yay! - I now have a fully working Nano with new bootloader and application loaded using this.</p>
<p>I have done so much that I'm not sure what the original problem was but the final change was modifying the &quot;programmers.txt&quot; file such that &quot;Arduino as ISP&quot; entry was changed as follows;</p>
<pre><code>Original line;
arduinoasisp.protocol=stk500v1

Changed to;
arduinoasisp.protocol=arduino
</code></pre>
<p>I did this because I noticed that the menu option &quot;Upload using programmer&quot; (which worked) invoked avrdude with the parameter &quot;-c arduino&quot; whereas the &quot;burn bootloader&quot; option used &quot;-c stk500v1&quot; (which was not working).</p>
<p>I can't pretened that I fully understand but I'm happy that this now works and that I have now learnt enough to know where to start looking if I get similar problems in the future.</p>
<p>I should also add that I would never have got here without the help of @timemage - who has helped a lot - many many thanks</p>
