ESP8266 Community Forum

I'm testing updating the firmware on a couple of -01 board. Every time I flash I always end up with an unusable board. After the flash, I hook up the Arduino Serial Monitor, RESET the board, and it only responds with something like this:



On 74880 baud, no less. I'm assuming this is a crash.

There appears to be dozens of resources on the internet, all with different instructions and with different firmware .bin file load addresses. Compounded with different firmware sets, NonOS, etc., I obviously haven't got the right mix of parameters to reflash.

All I know from the board is that what the Detected Info tells me:

flash vendor:
5Eh : N/A
flash devID:
4014h
QUAD;8Mbit
crystal:
26 Mhz

Can anyone point to a definitive resource that I can use to bring these clobbered boards back to a factory state? i.e. responds to AT commends?

Thanks!

try DIO and AT firmware 1.6 https://www.espressif.com/en/support/download/at

Thanks for the reply. I had already tried loaded the 'AT versions' of the firmware. What about all the other parameters needed to flash a board? Which .bin files since there are multiple versions, even in a single release, load addresses, etc, etc.

there is a readme file with the binaries
or read section "1.2. Downloading AT Firmware into the Flash" in "ESP8266 Non-OS AT Instruction Set" document.
https://www.espressif.com/en/support/do ... d%5B%5D=14