t25 from xfinity on optimum

Spent many hours on line/ on phone with Optimum trying to get a T25 xFinity working.

Can anyone provide me with the correct reference/ firmware etc…..to I can get the Optimum (NY)

tech team updated ?     From other posts it seems this should work.

Modem gets “Activated” by Optimum, goes through 3 cycles of reset (updates).

At that point the LED indicates it is ON LINE…..however no connection is made to my computer or router.

T25  Model #  613587-003-00  ( has a HFC MAC & MTA MAC #s, no CMAC like the old modem)

All help and advice, appreciated.