ESP8266 Community Forum

Hi everyone

I'm french so, sorry for my bad english.
I'm the owner of an ESP-07 module. I received it with 'ai-thinker.com' firmware. I don't remember the version. So before flashing it I tested it with some AT commands and everything worked well with this wiring:
CH_PD,VCC -> 3.3V
GPIO_15,GND -> GND

Then I pushed GPIO_0 to ground to flash the chip. I used esp8266_flasher.exe to flash nodemcu_512k_20141212.bin
But I had 'Invalid head of packet' errors... The problem was my aliexpress clone
of FT232RL. So I used CP1202 to flash and everything goes smooth but after disconnecting GPIO_O and restarting the module only bootloader worked.
The chip goes in an endless loop of error.

I think It can't access the SPI flash to boot user data.
Is my flash chip died ? Anyone has had the same problem ?
I also try to blank512k.bin the chip, try different flasher program and try a lot of firmwares (AI-v0.9.5.0 AT Firmware.bin, AT22SDK96b1-2015-02-15.bin...) but no one can boot.

Any help will be greatly appreciate.
Thanks

Here the bootloader output:
---

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

load 0x40100000, len 212, room 16
tail 4
chksum 0x5e
load 0x3ffe8000, len 788, room 4
tail 0
chksum 0x1c
load 0x3ffe8314, len 72, room 8
tail 0
chksum 0x55
csum 0x55
jump to user1
Fatal exception (0):
epc1=0x40211668, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
epc1=0x40211668, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
Fatal exception (0):
epc1=0x40211668, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000
(endless loop)
---

firstly you must to try to change power supply. secondly you can try full flash erase and re upload firmware.

Thanks for your reply but blank512k.bin wich seems to be a full erase doesn't work and I have already external 3.3v reg power supply, just ground connected together with CP1202 usb.

I have the same problem with esp-07