So had a look at this the other day, @Jarrett pointed out that the reciever cards have a serial eeprom chip on them, a SST25VF080B:
He figures it should be possible to dump and copy the storage from a good card, to a borked card, but won’t have time to try that until late December, if anyone else wants to give it a go though feel free.
I am making some progress on the configuration but still have to fix the individual pixel assignment order, new plan is to connect our 2 malfunctioning reciever cards each to a panel and try to configure it that way to get around the pixels not showing up on the screen issue. Won’t be able to try that till next weekend though.
Also, I started a new thread (to avoid thread clutter) about where do we install this thing. Have a look here: