Hello McWill,
I have exactly the same issue, I bought a Lynx II screen and as my Lynx II didn't manage to get the proper voltage for the screen, I decided to put it in my Lynx I... Now I also have an upside down image. And I just found out your answer... too late I guess !
Is it possible to make our screen work without having to reinstall it upside down ?
Thanks for your precious help !