ESP8266 Community Forum

Hi,
I have ESP8266 12-E (ai-thinker) module which have erased flash. Serial monitor (baud 74880) is showing (with GPIO00 connected to GND)



and (with GPIO00 floating)





For sure serial connection and power supply is OK.

Could you please recommend any working and up-to-date tutorial showing how to upload new firmware into flash and use ESP with Arduino IDE?

PS. Sorry for my english.

1st) redo the soldering. The solder job on pins and the module look pretty "dry".
2nd) use reccomended pullup's on gpio0/2, chpd and pulldown on gpio15.
allthough there are resistors on the board for chpd and gpio15 I had some of these adapters where the resistors had useless values (50k). I usually use 4k7.

schufti wrote:1st) redo the soldering. The solder job on pins and the module look pretty "dry".
2nd) use reccomended pullup's on gpio0/2, chpd and pulldown on gpio15.
allthough there are resistors on the board for chpd and gpio15 I had some of these adapters where the resistors had useless values (50k). I usually use 4k7.

Thanks for your reply. Unfotunately still the same symptoms.

1) Boot in normal mode (baud 74880):
2) Boot in normal mode (baud 115200):
3) Boot in flash mode (baud 74880):
I've redone soldering (hope it looks better now):


I've checked also resistors. R1 and R3 are both 10kOhm. R2 is not used.

philbowles wrote:...or buy a Wemos D1...

Maybe it's a solution. But my ai-thinker 12-E should work too.

Circuit like that was working well few days ago. Now I'm almost sure that problem is with wrong firmware, but I can't find any instruct how to upload right firmware.

schufti wrote:1st) redo the soldering. The solder job on pins and the module look pretty "dry".
2nd) use reccomended pullup's on gpio0/2, chpd and pulldown on gpio15.
allthough there are resistors on the board for chpd and gpio15 I had some of these adapters where the resistors had useless values (50k). I usually use 4k7.

Thanks for your reply. Unfotunately still the same symptoms.


I've redone soldering (hope it looks better now):


I've checked also resistors. R1 and R3 are both 10kOhm. R2 is not used.

I'am almost sure that circuit and power supply are OK. Especially it worked few days ago. I have absolutely no idea why it doesn't work now.

After upload any sketch via Arduino IDE serial monitor looks like:

philbowles wrote:...or buy a Wemos D1...

Of course maybe it's the simplest solution. But I just want to try fix that module... it will work... I hope

Any other ideas?