I had a bad experience with the UYS3 firmware (made my drive superslow). Like you I backed up my UDS1 firmware with ltnFW, and didn't know until later that ltnFW doesn't work properly with this generation of Lite-On drives. That is why is it doesn't update the drive's firmware and it also doesn't properly backup firmwares from this drive. Try loading the backed up firmware through Omnipatcher and it'll tell you the firmware is bad. The only program that I know that works with this drive is MTKFLASH, not MTKwinFlash. I got a backup firmware made with MTKFLASH from another user and indeed, it loaded up without problems in Omnipatcher.
All this information was not known to me when I updated my firmware back to my backup of UDS1 (made with ltnFW). My drive went dead and the computer doesn't even detect it anymore. Even MTKflash couldn't access the secondary IDE ports because I'm assuming my computer (Inspiron 6000) disabled those ports when it didn't detect anything. What I did to revive the drive was I borrowed a slimline drive from another laptop, boot the computer to pure dos, and hotswap the drive with the dead sony one. MTKflash can then access the secondary IDE ports to reflash the drive. Just make sure you flash it with the proper UDS1 firmware, not the backup one made with ltnFW. Sorry for the long post but just wanted to share my experience.