I also have the same problem, I bought it from Seedstudio, and recently (about 2 months) all 3 devices (used on rpi4) started to stop working… I tried to add them again, it sees them, but it tells me that the firmware is not good… and that I should update them with the correct firmware… but “SL Web Tools” - The firmware update is temporarily unavailable.
I mention that I haven’t updated them since I got them, and that they worked very well until 2 months ago… I think it was something generated by the Home Assistant updates.
