maybe i am blind for i already had checked this site before asking but i see no
107b2v4 firmware. is the name something different under NEC 2500 firmware?
and will 2510 firmware actually work on a 2500? these may sound like foolish questions but if a mistake is made the burner is trashed. best to ask someone who has done it and how and which firmware exactly they used to success. learn yes, ask yes, succeed yes yes yes. i would sure hate to screw up for lack of asking some simple questions