Makes the TP-Link UB500 (and other RTL8761BU USB dongles) work as a real Bluetooth controller on macOS 12–26 by uploading the Realtek firmware at boot — the same approach Linux's btrtl driver uses, ...

Note that for some devices (e.g. Raspberry Pi), at the end of the flashing process the tool tries to customize the SD card e.g. it configures a hostname or WiFi. And with a cloud-init enabled image ...