Hi I tried doing an OTA upgrade from 0.8.0-rc.27 to 1.4.2 and it caused the the Boron to go completely dead with no Leds on except a yellow one that’s right next to the power cord input. Tried disconnecting power but still dead.
regards,
dad
Are you able to put the device into DFU mode (blinking yellow)?
If you can, run particle update on it, which should restore it to a sane state.
One other thing – if this is a Boron 2G/3G, then you should never run it without the battery unless you have a very robust USB/DC power supply (by “robust” I mean that will not sag with an instantaneous power draw increase from the Boron, up to 1800mA for 2G, 800mA for 3G). That could cause problems with OTA flashing, depending on the RAT/RSSI at your location.