I ordered recently few ESP-12F modules from https://pl.aliexpress.com/item/32349713 ... 5c0fE2gUrc. I received slightly different than the ones presented on the photo (they are branded by Doiting instead of AI Thinker).
When I powered on one of the modules I got following error:
Fatal exception (0):
epc1=0x40100000, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x0
0x40100000: _stext at ??:?
I erased flash using esptool and uploaded some simple app from ESP8266 RTOS SDK examples. After powering up module is stuck at this point:
ets Jan 8 2013,rst cause:2, boot mode:(3,7)
Tried also with another piece and it's all the same.
I used already few other modules (mainly ESP-12E) with the same circuit and never encountered such problem.
Does it mean that modules I've got are just fake/broken?
Maybe someone had similar problem?