user19637: I bought an arduino compatible board here: http://unsigned.io/projects/micromodem/
and am trying to flash new supported firmware onto it. The only instructions given to flash the board is to use the command avrdude -p m328p -c arduino -P /dev/ttyUSB0 -b 115200 -F -U flash:w:YourFirmwareFile.hex . 
I'm trying to follow the tutorial here using an Uno as a programmer: https://learn.sparkfun.com/tutorials/installing-an-arduino-bootloader#uploading-code---hard-way but I don't know what to use for the fuse settings. I've tried a few different fuse settings such as the one for the Uno, and default 328p ones using a fuse calculator but it seems like they all have unpredictable results. Some fuse settings make it so that I can't connect  to the COM port at all to monitor the traffic, and others let me connect, but send a message of . I'm expecting an introduction message from the firmware that is supposed to be built in.
Thanks for the help. 

user19322: Normally you don't need to change the fuse settings, this configuration should be fine with the default arduino setting of 
lowfuse=0xff 
highfuse=0xde 
extendedfuse=0x05
Serial should work fine.

19637: <p>I bought an arduino compatible board here: <a href="http://unsigned.io/projects/micromodem/" rel="nofollow">http://unsigned.io/projects/micromodem/</a>
and am trying to flash new supported firmware onto it. The only instructions given to flash the board is to use the command avrdude -p m328p -c arduino -P /dev/ttyUSB0 -b 115200 -F -U flash:w:YourFirmwareFile.hex . </p>

<p>I'm trying to follow the tutorial here using an Uno as a programmer: <a href="https://learn.sparkfun.com/tutorials/installing-an-arduino-bootloader#uploading-code---hard-way" rel="nofollow">https://learn.sparkfun.com/tutorials/installing-an-arduino-bootloader#uploading-code---hard-way</a> but I don't know what to use for the fuse settings. I've tried a few different fuse settings such as the one for the Uno, and default 328p ones using a fuse calculator but it seems like they all have unpredictable results. Some fuse settings make it so that I can't connect  to the COM port at all to monitor the traffic, and others let me connect, but send a message of . I'm expecting an introduction message from the firmware that is supposed to be built in.</p>

<p>Thanks for the help. </p>
 19322: <p>Normally you don't need to change the fuse settings, this configuration should be fine with the default arduino setting of </p>

<p>lowfuse=0xff </p>

<p>highfuse=0xde </p>

<p>extendedfuse=0x05</p>

<p>Serial should work fine.</p>
