A simple search will find you this:
Quote by Nemesys
[I]There are two models of this drive and the both use different firmware.
There is the LTD-163 and the LTD-163D.
Plus there is also an OEM LTD-163 from Dell.[/I]
You need to find the right firmware for your model and reflash the drive, afterwards it will work again. If you don’t know which firmware to use reply to this with the correct model number and I will send you the firmware