Teac W524EB. Firmware need



I’ve bought black Teac W524EB. It seems to be IBM OEM, but i don’t know exactly. It has 1.8C (sic!) firmware, which does not have RAW DAO. I can’t overburn :-((( I tried to overburn, but failed. Does anyone know, what can i do with that drive? Can i change firmware? Teac’s flasher doesn’t allow to flash that drive.