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Flashing.md

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Notice

Modifying and flashing of devices is at your own risk. I'm not responsible for bricked or damaged devices. I strongly recommend a backup of original firmware before installing any other software.

How to flash

I was not able to flash the firmware via tuya-convert. So I did the wired way.

1. Prepare your device

  • Remove the screw in the battery holder
  • There are 4 pinouts, for flashing only use the 2 in the middle, RX and TX
  • Connections VCC, GND and GPIO0 have to be soldered directly to the module
  • Don't insert the batteries during flashing, then the module can't be flashed

Flashing connection

2. Connections for flashing

Following connections were working for me (refer to ESP-12E pinout):

  • Red: ESP-VCC connected to Programmer-VCC (3.3V)
  • Black: ESP-GND connected to Programmer-GND
  • Black: ESP-GPIO0, must be connected with GND during power up
  • Green: ESP-RX connected to Programmer-TX
  • Yellow: ESP-TX connected to Programmer-RX

3. Backup the original firmware

Don't skip this. In case of malfunction you need the original firmware. Tasmota has also a great tutorial for the right esptool commands: https://github.com/arendst/Sonoff-Tasmota/wiki/Esptool. So the backup command is:

esptool.py -p <yourCOMport> -b 460800 read_flash 0x00000 0x100000 originalFirmware1M.bin

for example:

esptool.py -p /dev/ttyUSB0 -b 460800 read_flash 0x00000 0x100000 originalFirmware1M.bin

4. Upload new firmware

Get the ESP in programming mode first. Erase flash:

esptool.py -p /dev/ttyUSB0 erase_flash

After erasing the flash, get the ESP in programming mode again (GPIO tp GND). Write firmware (1MB)

esptool.py -p /dev/ttyUSB0 write_flash -fs 1MB 0x0 WThermostat_x.xx.bin

5. Prepare for first time run

  • Unplug all connections from programmer
  • Insert batteries