I think a lot of OEM solutions are done through the logo.bin and oem.xml
What makes me think that is that recently a friend of mine was playing with OEM.XML. Basically he installed a blank oem.xml and in the Garmin Directory on a nuvi 1350 China Logo.bin (1340-65) . Once the nuvi rebooted it added some numbers to the Last line of the inventory.(Oem cnfg) and deleted the OEM.XML
After another reboot his Nuvi Bricked. It did not go past the first Garmin Screen. The solution was to re flash the Logo.bin with 1340-50
So maybe if you have re-flashed your Logo.Bin you won't be able to go back to BMW Firmware and enable the Audio Output settings.
If you dont have the oem.xml this could also pose a problem.
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