Mmi 2g update - optic loop?

[ainarssems]

. And, does that mean unofficial discs sometimes don't work because they are burned (instead of pressed), and don't get the proper info for the nav player to recognise it, as Ainarsemms mentioned?

Burned discs will contain the same info it's just that old weak(ish) lasers cannot read them reliably.

I might not be 100% corect but original discs are pressed with template to create dips and peaks, then covered with relective layer. When you burn recordable or rewritable discs they are already coated and you create dips and peaks afterwards.