If its been downgraded to 3.55 rogero downgrader pup. My guess is that they couldn't qa flag it because of non working bluray drive. Hence why they didn't go all the way to 3.55 OFW
What is wrong with the actual drive exactly. Try and get a replacement drive and remarry. You can still do this on downgrader pup.
Playstation 3 (PS3) E3 flasher CFW Downgrade Service (Latest Official Firmware to 3.55/Latest Custom Firmware) NOR Flash Only (UK)