Enter Bootloader with ESP8266 Rev. A

[borzo83]

How can I enter the bootloader mode with an ESP8266-EVB-BAT / MOD-WIFI-ESP8266-DEV (Rev A) without an reset button?

I get this error in Arduino IDE when trying to upload a sketch:

warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_upload_mem failed

With an ESP8266-EVB-BAT / MOD-WIFI-ESP8266-DEV (Rev B) I had no problems.

[Lurch]

On the MOD-WIFI-ESP8266-DEV
You need to set pin 21 (GPIO0) to GND while you reset.
Reset by setting pin 13 (RSTB) to GND
So, the sequence is, set GPIO0 to GND, then RSTB to GND for a moment, and then you'll be in bootloader.

[borzo83]

Thank you for the response, I have tried this without luck.

My question was actually concerning this module:
https://www.olimex.com/Products/IoT/ESP8266-EVB-BAT/open-source-hardware

[borzo83]

On the MOD-WIFI-ESP8266-DEV
You need to set pin 21 (GPIO0) to GND while you reset.
Reset by setting pin 13 (RSTB) to GND
So, the sequence is, set GPIO0 to GND, then RSTB to GND for a moment, and then you'll be in bootloader.

Finaly that worked for me, only that I pressed and held the onboard BTN and then pressed the onboard RESET Button.
Thanks!