Liteon firmwares

Hi guys i have a Liteon 16X dvd (LTD 163) which is the best firmware to use, i currently have GH5S and was planning to update to a newer one

Which firmware is most reliable?? in reading protection and replicating?

What is the differen between the 163 and 163D? which one is better

If you use Exact Audio Copy, this thread may be of interest.