USB CSR Bluetooth Injection Driver for MacOS BigSur
This kext is just Info.plist which adjusts vendor id and product id of USB Dongle. if your CSR Bluetooth USB Dongle still doesn't work maybe you can adjust the vendor id and product id. Just right click Show Package Contents, go to info.plist -> IOKitPersonalities -> CSR50 and change value of vendor id and product id. Note you need input decimal value, so you must convert hex value to decimal.
Tested on MacOS Big Sur 11.4 - USB 2.0
