FYI, I am in the same situation. I have bricked 3 or 4 MR24HPC1 devices trying to get them working in home assistant. In my opinion, they seem extremely fragile when being handled with bare hands. I have never had any issues with MCU’s or other semiconductor devices, as I live in Florida and there is no problems with static electricity. But any handling of the MR24HPC1 Lite board seems to render them useless. I cannot re-flash them with the UART tool as them just stop responding to input. Now to be fair, the data sheet warns you to not touch the boards, and handle them only along the edges, But…
When it comes to handling, the biggest problem I am encountering is the 6 pin connector for the UART. It’s using 2.0mm pitch like for GROVE, but there is no GROVE connector for two rows of pins!. And, the spacing between rows is too narrow for two GROVE or standard JST-PH connectors to fit side by side. so getting a good connection is nearly impossible without grabbing the board. If Seeed would only make a 4 or 6 pin connector for that UART side of the board, I wouldn’t have to hold the board with my bare hands to try to get breadboard jumpers to attach to it.
I have also noticed that when using the Arduino example MR24HPCB1_rawdata_print.ino on a working board that it stops putting out frames evern second after about 2 hours. A re-boot of the board is needed to get it to output again.
I would like to think that the bricked modules can be salvaged, but for now, I’m thinking they are trashed, and I’m being very careful with the few I have remaining…