Soldato
It is possible to upgrade a car with NBT EVO (ID6) to MGU (ID7) but the cost is pretty serious as you need a new Kombi/instrument cluster, MGU "high" unit, screen, controller, RAM module plus a few other bits. If the cost is several thousand then potentially it's an OEM retrofit for true ID7. If not and it's a few hundred quid, it's an MMI box which has the usual issues.Surely it must be if the car doesn't have iDrive 7?
An MGU unit alone is around £2.5K from BMW in a virginized state. If you buy a used one, the guys in Europe who can erase the existing VIN and component protection are charging upwards of £1000 just to unlock them and provide the FSC codes. I would say in parts alone you're talking close to £6K.
Looking at GARetrofit, it's not an MGU upgrade. It looks more like an upgrade for those who currently have NBT (ID4) to NBT EVO, which can handle Apple CarPlay and Android screen mirroring only, not full Android Auto. This is much easier to do by yourself with less parts needed and software readily available on the internet to deal with FSCs.
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