Welcome to the forum.
Upgrading the 2500 to a 2510 for DL burning is easy.
Go to Liggy & Dee's website here and download Liggy's NEC 2510 bitsetting 2.19 firmware. You've the choice of original , RPC1 - no region code checking - or fast. I'd go for the RPC1.
Then read & follow the Flashing tutorial linked on the lower left.