what version of MacOS are you trying to boot? There are still uses with Beta 4 on Bluetooth. I can't get Beta 4 to trigger even on my new Lenovo Card yet. I was able to get BT to work with Beta 2 and Beta 3 (not with the BCM 20702B0 BT4LE card but with an Intel Wireless card).Tried the BluetoolFixup.kext, It wouldn't boot anymore, just get stuck at the apple logo. Luckily I can boot into Windows and edit the config.plist and remove the entry and it boots just fine.
Nothings working yet, Bluetooth is dead for now.
If your system does not be boot try booting at -v to see where it is stopping at, you may need another kext for your bluetooth card, your card may just be incompatible with Monterey or it's how it's treating the USB for your bluetooth. This is why many are bypassing the USB on their BCM card and redirecting it to another USB card or Hub. I'm doing the same my Lenovo Card just without any soldering or nail polish.
I am assuming you will need some type of Firmware.kext for your BT card to work.
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