As promised, here are the .bin firmware of both the CD-W548E, CD-W552E. Both drives have the same firmware revision (V1.05) but not the exact same board design, so we don't know if OC is possible (Nero reports BURN-proof for the CD-W552E, which seems wrong).
Both firmware was ripped with MTKFlash v1.55 either with the /M (merge in one file) setting, or also ripping each bank seperatly. We don't know if those rips are correct since MTKFlash v1.55 cannot recognize the board type of both TEAC drives. Use it YOUR OWN RISK! You would need WinRAR v3.xx series to un-rar them!!!
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TEAC CD-W548E v1.05 (ONE file) -
TEAC CD-W548E v1.05 (7 files) -
TEAC CD-W548E v1.05 (ONE file) -
TEAC CD-W548E v1.05 (7 files)