I have BT851-ND
Currently running macOS 12.5 with BrcmPatchRAM-2.6.3-RELEASE, kexts installed are:
BlueToolFixup
BrcmFirmwareData
BrcmNonPatchRAM2
BrcmPatchRAM3
Bluetooth works on Magic Trackpad, Airpods, bluetooth earbuds and handoff.
Bluetooth DOESN'T work on Airdrop, use Apple Watch to...