ESP8266 Community Forum

- Fri Jun 12, 2015 3:33 pm #20293 I don't believe that 50 cycles should kill them.
If you burn to the flash and read back via esptool.py is the data different?

Cal

Get your modules here:

https://www.banggood.com/custlink/KvGGhGF4wG

- Sat Jun 13, 2015 11:25 am #20364

I don't believe that 50 cycles should kill them.
If you burn to the flash and read back via esptool.py is the data different?

Cal

no, they are the same! very strange...

anyway my esp8266 suddenly can't boot anymore...

- Sat Jun 13, 2015 11:36 am #20365 I just noticed a strange thing:

if I set baud rate 115200 (and not 9600 as nodemcu default!) i always get this string on boot:
"rlsì"

i think that it can't be a coincidence because if I put the esp in bootloader mode (gpio0) i always get "rl"

edit: another thing. if i set 74880 baud rate i get

Code: Select all ets Jan  8 2013,rst cause:1, boot mode:(3,6)

load 0x40100000, len 28740, room 16
tail 4
chksum 0xe7
load 0x3ffe8000, len 2888, room 4
tail 4
chksum 0xd6
load 0x3ffe8b50, len 15536, room 4
tail 12
chksum 0x39
csum 0x39

- Sat Jun 13, 2015 12:28 pm #20371 FIXED!!!

I was thinking...how could a new flash solve the problem if the firmware is correctly written into the flash? (verified with esptool.py)
Maybe there is something AFTER the firmware? Maybe the "erasing_flash" command doesn't work???
So i flashed a 512k BLANK bin into the esp and THEN flashed the nodemcu and....booom! WORKED!

So, before replace the flash...

1) flash https://raw.githubusercontent.com/funsh ... nk512k.bin
2) reboot
3) flash your favourite firmware

Many thanks to @cal for poiting me in the right direction!