Hello,
I bought a ATU-100 from ebay. It is one that operates off of internal batteries. It works pretty good and the only issue is that it has an inverted OLED display.

I took off the front panel hoping that I could just flip it and i looks more complicated than that

I contacted the seller and it appears like he is gone with the wind. As I said it works pretty good. Is it possible to flip the OLED? Also if it is possible would it be a complicated procedure??
Thank you