Thanks to our bro's over at CDFreaks for the heads up! 2510 (Dual layer) firmware works on 2500! I have the nec2510a firmware. I have applied the firmware on my nec2500a and so far it can burn single layer disc. I don't have any dual layer to try it on. But I still need to test it somemore to make sure it works fine for the single layer as i got 1 failed burn during one of the test.

CDFreaks