Sounds like a Bad Flash sorry to hear it but have a read of This and also Here and I think there is some info about it in the Lite-On Thread as well, itâ€™s happened to a few people so using the Search might give you some help as well.
Snowus I was hopping there was something in the Links to help you recover the drive, the Firmware you used might of been incomplete of it didnâ€™t Flash correctly so it shows up as 1633 but the drive is still not working . One thing I have never tried to do is crossflashing a drive so I canâ€™t talk from experience, I can only give you a few suggestions, but have you tried using FlashFix on your Firmware before you try and Flash it back to a older version ? Also try using Mtkflash and try and Flash back to a Sony with the Firmware your drive came with even if you donâ€™t have the original, download the same version and try and use it, On the link where you download Mtkflash there is also a very detailed Tutorial on how to use Mtkflash. Hope itâ€™s of some help to you to recover your drive.
Snowus if you are going to Flash DVD drive from you HD make sure itâ€™s formatted to Fat 32 , if you are running XP on a NTFS file system, DOS will not work! it will only work on a Fat 32 Formated HD. I donâ€™t know why you canâ€™t use your â€œ \ â€œ it sounds very unusual, From the site you down loaded Mtkflash follow the link and download DOS 7 and put Mtkflash and your firmware on a DOS 7 Boot Floppy and Flash your drive from the Floppy, that way you donâ€™t have to use your â€œ \â€ .