I really don’t understand this fury against Sonoff ZBBridge.
The greater reliability of a wired line compared to a wifi link is obvious (as warned in the zigpy github) but somebody could be forced to use a wireless bridge for many reasons.
I personally use the sonoff device without any problem and the infamous error “NCP entered failed state” happens very rarely and does not affect my system reliability.
I am not able to uplaod the ncp-uart-sw_6.7.8_115200.ota file. I am still getting the invalid file signature message. I use tasmota 12.5.0. There was no reset action after the “Backlog Weblog 3; so65 1; Module 75” command given.
I have made a same mistake with the wrongly flashed tasmota (that fw doesn’t have a module 75). For the fix, I need to flash the minimal version first. Then the zb-version of tasmota and finally I was able to flash the uart fw.