NEC ND-2510A v2.0T original firmware (NEW 06-01-2005)
http://www.micheldeboer.nl/firmware/2510FW20T.zip

NEC ND-25x0A 2.18, supports +R(W) and +R DL bitsetting and DL burning for both 2500 and 2510!
(NEW 08-01-2005) from Herrie
http://www.micheldeboer.nl/firmware/25x0 v3 test.rar

New NEC 25x0 hacked bitsetting firmware 108v3/218v3
http://club.cdfreaks.com/showthread.php?t=121623