user49013: Today I finally got two HM-10 modules. I did flash firmware using this tutorial. It worked until I didn't send AT+RENEW command. Now, LED blinks, I see device in BT terminal(Android phone) but I can't connect to it. Terminal says Connection failed: write descriptor failed. I tried sending commands over COM port from PC, but it doesn't responde.
Also I connected pin 11 to GND, problem is still here. Strange thing - After firmware flash, AT+HELP doesn't exist, while AT+HELP? returns some website.
For second module, LED doesn't blink but I see module in BT terminal. It also stopped working after AT+RENEW. When I try to connect, I get same error.

user62991: change your COM serial baud rate to 115200. I had the same problem and the moment I change the baud rate on my Serial Com or Serial monitor. it works for me

49013: <p>Today I finally got two HM-10 modules. I did flash firmware using <a href="https://forum.arduino.cc/index.php?topic=393655.0" rel="nofollow noreferrer">this</a> tutorial. It worked until I didn't send <code>AT+RENEW</code> command. Now, LED blinks, I see device in BT terminal(Android phone) but I can't connect to it. Terminal says <code>Connection failed: write descriptor failed</code>. I tried sending commands over COM port from PC, but it doesn't responde.
Also I connected pin 11 to GND, problem is still here. Strange thing - After firmware flash, <code>AT+HELP</code> doesn't exist, while <code>AT+HELP?</code> returns some website.</p>

<p>For second module, LED doesn't blink but I see module in BT terminal. It also stopped working after <code>AT+RENEW</code>. When I try to connect, I get same error.</p>
 62991: <p>change your COM serial baud rate to 115200. I had the same problem and the moment I change the baud rate on my Serial Com or Serial monitor. it works for me</p>
