Ivan Belokobylskiy

One of the possible problems is that ZCL attributes should be without manufacturer's code, while Heiman/Aqara should contain a manufacturer's code, which i don't know. Otherwise, i don't understand how...

Implemented in https://github.com/Koenkk/zigbee-herdsman/pull/1116

The detailed description of flashing is written in the main readme. In most cases changing uart dongle helps. And, try use python script, it has feedback using tx wire while...

Yes, both to P14. It is an emulation of single wire protocol by using a resistor to distinguish 'in' and 'out' signals.

There is a chain of actions. When device is working it uses SWS pin as gpio and it is difficult to flash it. For this case you need to -...

@trablin45 You can try a fork https://github.com/pvvx/ZigbeeTLc or revert to BLE using z2m local OTA It is not the normal consumption for the device, connected to coordinator

Yes, you can use these binaries: https://github.com/pvvx/ZigbeeTLc/tree/master/bin/devbis

Please, try to erase flash and write it again. You could lower the baudrate while writing

You should use UART to write firmware in your case. Follow the steps in Readme in this repo.

Here is a soldering schema.  The command looks okay. But you'd better follow the instruction in README as is covers some cases