Yep
I got the firmware from here: http://liggydee.cdfreaks.com/page/2500/
On my 2500a I used "Dee's ND2510 modified firmware 2A5C" - "Orig" (Because I don't know what "Fast" or "RPC1" are).
It worked for me. And fixed my problem
A big thanks to Liggy and Dee from CDFreaks :D
Fast - Unlocked ripping speed, I think it is locked to 2x by default (don't hold me to that!)
RPC1 - Essentially the drive is region free, thus meaning you can play region dvd