ESP8266 Community Forum

Hi, 


Could someone please explain if I (naively) loaded  NODEMCU  on my ESP8266 wifi shield  can I revert it back to normal SDK firmware to run AT Commands ?



Background.

Bought a clone ESP8266  WIFI shield (UNO/MEGA) by WangTongze V 1.0  with the 4 pin dip switch and references non existing website elecshop.ml .   Long story short it did not work properly on arrival,  contacted vendors and they sent NODEMCU flashing tool, this did not work too, but armed with this info, I downloaded latest NODEMCU and flashed the shield  and did not realise I would get  LUA.....   not AT command set.

So I am trying  to load SDK and AT using ESP8266 download tool (from Espressif) onto the shield,   but it always fails on SYNC !!   So the shield is never recognised.    I can reload NODEMCU without too many probs.   But I need the AT command set  not LUA.

Hardware  -   the shield is plugged into an UNO  which   ONLY   provides power.   I then communicate  with the ESP8266 via the shield debug port through an FTDI module to a PC.

Only have RXD, TXD and GND connected between  ESP8266 and FTDI.    I think all connection ok and NODEMCU works,  but as above cannot run ESP8266 download tool   beyond SYNC.

Thanks

Hi,

Have since discovered that in programming mode my esp8266 is running at 74880.
and on reset prints

"ets Jan 8 2013,rst cause:2, boot mode:(1,7)"


and in run mode, on reset

"ets Jan 8 2013,rst cause:2, boot mode:(3,7)

ets_main.c"


The ESPdownload Tool 3.6.1 has a minimum speed of 115200.

Any advice on how to align the speeds??

Thanks

The internal bootloader adjust itself to the uploader tools speed ...