ESP8266 Community Forum

- Thu May 19, 2016 11:13 am #47662 I have an ESP8266-01.
I can upload Arduino compatible programs to it without any problem.

Does uploading a program to the ESP overwrite the AT command interpreter?
I can not sent any At commands anymore.

- Thu May 19, 2016 11:31 am #47664 This is completely normal !
AT firmware is one thing and Arduino Sketches is another firmware.
Uploading any firmware is completely erasing the previous one.
You can NOT have both at the same time, there is no concept of "dual-boot" on ESP ...

- Thu May 19, 2016 4:37 pm #47687

This is completely normal !
AT firmware is one thing and Arduino Sketches is another firmware.
Uploading any firmware is completely erasing the previous one.
You can NOT have both at the same time, there is no concept of "dual-boot" on ESP ...

Thanks for your answer Martin.
That's what I was expecting. (but not sure)

Is there a way to restore the AT firmware (just for testing purpose) ?

- Thu May 19, 2016 4:50 pm #47691 Yes, but you have to get of copy of the AT Firmware from the Espressif SDK downloads, or, if you have another module which still has it, you can use esptool.py to do a backup.