SamyGO

2007 firmware should be old enough, but if you have problems, give TV downgrade to much lower firmware - i hope TV accepts it. Might it solves problems you get.

It seems, 2007 is post-FEB and has well known limitations. Sure, you can`t use tool for alternative firmware activation, because it activates back your previous - latest firmware. I see only way you have - nurisam game, signed with your UDN, as carrier for samygo games...

Here is related topic, try...
use internet explorer for nurisam, password must contain letters and numbers. If you do not find your TV model, use similar to yours, LN model (it does not matter).

FFB is already tested and works well on B7000 CI+. If you still need to flash older firmware, you could help me in testing (harmless tests) your model. PM me please.