ESP8266 Community Forum

- Thu Jan 22, 2015 5:55 am #7941 Hi,

i have 3 ESP8266 with Firmware "0018000902-AI03" so they often boot loop and i decided to update one via "AT+CIUPDATE". So it does Update 1- Update 4 without any erros. And then there was no "OK" but anything cryptic and nothing more happens. As i restartet the Modul, nothing readable printed out. I connected my Logic analyzer and figured out that Baudrate is "75471". I now get the following message on Boot:

Code: Select all ets Jan  8 2013,rst cause:1, boot mode:(3,7)

load 0x40100000, len 25052, room 16
tail 12
chksum 0x0b
ho 0 tail 12 room 4
load 0x3ffe8000, len 3312, room 12
tail 4
chksum 0x53
load 0x3ffe8cf0, len 6576, room 4
tail 12
chksum 0x0d
csum 0x0d

So my modul doesn't accept any AT command. In Boot mode, GPIO0 hold low, i get the following message:

Code: Select allFatal exception (0):
epc1=0x40100002, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000

in a loop.

Edit: it's not my power supply. I use an 5A 3V3 power supply.

Is there any way to rescue my ESP8266?

- Thu Jan 22, 2015 9:19 am #7946 Hi, the same happened to me. That command must be a joke, it's a real killer.
I cured mine with flashing the Firmware. I used the new V20 and everything worked again after that.
Why implement such a command if it's not save to use it, unbelieveable.

- Thu Jan 22, 2015 1:40 pm #7961 Hi i try to flash with another Firmware, but it doesn't work. I can't flash it. All Flash tools can't connect. Is there any trick?

- Thu Jan 22, 2015 6:42 pm #7986 I am in the same boat. It p*())& me off so bad, I just get my 07 working try to update it and its now a paperweight. I found several things online saying you can just re-flash it using some of the tools but nothing I have tried can connect to it anymore.