Moteino LED doesn't flash and programs can't be uploaded

[deven.orourke]

I have two moteinos (R6) I've used successfully for all kind of projects. I am trying to upload a new sketch, and getting the following error message in the Arduino IDE:
"avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x76"

The LED on the moteino doesn't light up at all - not when I plug it in to the USB adapter and into my computer, nor when I apply an external power supply to Vin. When powered, shorting RST to GND does nothing - no LED or anything. Have I somehow messed up the bootloader?

If I have, it seems I may be able to use an Arduino to burn the bootloader back onto my Moteino. An older forum post that seemed promising gave a link, but it is now dead. Am I ok to use this guide to attempt to put a bootloader back on my Moteino? I appreciate any assistance.

https://docs.arduino.cc/built-in-examples/arduino-isp/ArduinoISP/

[Felix]

It's possible the LDO is damaged. You can easily check if you get 3.3v on the Moteino 3v3 pin.
Or the MCU has some issue, or bootloader was somehow damaged.
I would try the ISP route to burn a bootloader on it and see if that gets you anywhere.
Just be sure to use a 3.3v Arduino for this purpose (power is ok at 5V into the Moteino but the data lines need to be 3.3v).