How is that possible ? LW28 and LM50 are total different kind of projector, LW28’s firmware would never be able to be write successful in LM50’s main boards, we definitely would noticed if the upgrade is not succeed after repair
LW28 is ultra short projector with smaller size while LM50 is Large Venue projector with bigger size.
Can you take a picture to me of the main boards ? A clear image of S/N would be appreciate.