@statotec the problem for you is that you changed SMBIOS to MacBookAir6,2
That doesn't work with USBPorts.kext and therefore USB Ports have remained unimplemented for you.
If it's your previous iMessage values why you kept with MacBookAir6,2 then i will have to update USBPorts.kext to work with both:
- MacBookPro11,1
- MacBookAir6,2
Although the optimizations have been mainly done in the entire system for MacBookPro11,1 which i would recommend everyone switching to it.
Meanwhile, here is a updated USBPorts.kext for you which includes MacBookAir6,2 support and should solve your USB Problems including Bluetooth which is directly related to USBPorts.