Houston, we´ve got a problem... Mixed cell code

Hardware diyBMS
1

Unfortuneately I had a defective cell board.
Finally it seems also the Attiny is broken. However…

I have some spared and made a new board.
Flashed it with the controller V4.4.
All other boards I flashed with a controller V4.2

The replaced cell module has: Module version 440 / [e0a35694]
The others have: Module version 440 / [1651a79]

The controller reports cell module version mismatch.

Is there any chance to downgrade the replaced one?

My system was OK. Upgrading all other would mean to disasemble the whole Battery.
I use 1.9f boards…

2

You can simply pull the jumpers, then you can reprogram the 1.9f boards.

3

I have no jumpers. I have bridges.
And this does also not solve the problem.
The controller is monted on the wall. Meters from the battery.