LTD163D using LTD163 firmware?

I received an email the other day, which went like this:

I have fixed this problem by editing the ltd 163 firmware and flashing it in

Now eveything works fine

Use a hex editor on the firmware updater and replace the firts instance of LTD163 to LTD163D

next, change the firmware version string to the version just before the old firmware
so : change GH5K to GHR2

then flash the firmware in…

Problem is, I don’t know for sure if the 163D will work with the 163 firmware. Anyone tried? The problem I had was with the 163D not reading some DVDRs, and I’m eager to see if this will work.