Yeah sorry, pretty hungover when I read that and I missed the part about the display 🙂
Before I installed the firmware on my DIY barebones assembly, only one LED lit up when the unit was powered on. I remember because I was wondering why they weren’t both illuminated and being concerned that I must have installed one LED with incorrect polarity or messed up something else. I don’t recall the colour, but I’m 100% that only one was lit up. So perhaps the source of the fault is something other than the firmware.
Anyway, sounds like you’ll need help from an expert rather than a dabbler.