@kunix
Are you interested to discover how the US 4.50 & 4.60 Goldwing fw is able to see NT images? I have long wondered if the NT capability of those 2 fw versions could be used to do the same with SP 2600 series which seems to be similar hw.
These particular navi units update fw only from CF card and are not accessible in the way a Garmin unit is normally afaik. I don't have access to one at present unfortunately, perhaps overman2008 can assist with testing?