JDM 2007 R35 GTR spare keys issue

[R33DRIVER]

I only have 2 remote keys for my car! My spare remote key is dead and went back to a garage for service and buy a new spare key! The problem is the mechanic with his latest GTR consult can not access into the key section for setting new keys somehow! His opinion is that I have replaced with a USA English audio unit together with an European (Russia - English mode) gauge cluster that may be the cause of problem for accessing into the remote key diagnosis for setting up new keys! I am totally don't understand what he is saying! But the daily use existing key is working fine! Is there any suggestion on this issue! Please help!

The mechanic demonstrated with another similar JDM GTR (which use Cobb Access Port)! The display and gauge cluster are in original Japanese display, and with his GTR consult he can access into the remote key diagnosis without any problem!