I've just got hold of 2 16x DVD drives. They both were in working order but locked to R2. I've tried to unlock them with firmware i got from digital-digest.com and now both of them won't play cd's or dvd's in windows. I've tried to flash them back to there original settings, but they still don't work. Is there anyway of correcting this?

The drivers are BTC BDV 316B & Acer DVP 1648A