IMO the Lite-ON firmwares are the best. You could safely flash your drive with any of the following:
TDK 5200B (67U2, or 67U4)
TDK 4800B (S7S3, S7S4, S7S5, S7S7, S7S8)
CCR-6S48 (2SG1, SSG2, SSG3)
CCR-6S52 (6SG1, 6SG3)
LTR-48126S (2S03, 2S07, 2S0A, 2S0D)
LTR-48246S (SS02, SS06, SS08, SS09, SS0A, SS0B, SID1)
LTR-52246S (any of course
)
Memorex 48MAXXv 2 (SWS3)
Memorex 52MAXX (6WS2, or 6WS3)
Sony CRX210E1 (2YS1, or 2YS2)
Sony CRX215E1 (SYS2)
Sony CRX220E1 (6YS1)
Verbatim 522452AL (68S1)