HELP!- flash tuya-based XR3 contact sensor

ESPHome
1

Has anyone come across this board and managed to flash it over serial?
(I suspect someone has, since there’s an ESPHome template for it).

This board is inside a Mirabella Genio window/contact sensor.
It’s a Tuya-based XR3 module.
I’ve been racking my brain trying to flash this over serial with no success.

PXL_20210626_110512959
PXL_20210626_1105129591496×4032 533 KB

PXL_20210626_110535379
PXL_20210626_1105353791405×3954 679 KB

I’m using a USB to TTL device CP2102. It has light indicators next to its TX, RX, GND serials, and I can’t find a combination where both TX and RX are lit (which I suspect would mean they’re able to communicate with the board, I guess??)

I believe I’m meant to be using the 3V3 and GND pins on the bottom-right-hand side of the back of the board, and the RXD, TXD pins.
I get the following errors (during attempts at various pins)

Unexpected error: ESP chip Auto-Detection failed: Failed to connect to Espressif device: Invalid head of packet (0x00)

Unexpected error: could not open post 'COMS': PermissionError(13, 'A device attached to the system is not functioning.', None, 31)

Can anyone offer help here?
Otherwise, does anyone know another forum where I may have a better chance finding advice?
Thanks all

2

You cannot flash that chip with esphome. Esphome is for esp chips (the clue is in the name). Mirabella must have changed their design.

3

If the pinouts line up right, you can do chip replacement of the XR3 to an ESP chip digiblurdiy on youtube just put out a video of doing these types of replacements. Or you can check out this page Open source firmware for XR809 compatible with Tasmota HTTP/Home Assistant where a dude figured out how to start writing custom firmware for the XR3/XR809 chip using I think the same sensor you have. I’ve been messing with the same project for a water sensor