I redesigned how the LED and BOOT switch are used, holding it 3 sec start inquiry scan (and LED start to pulse), short press while inquiry scan is on cancel it (and LED stop glowing), one short press outside of inquiry scan kick out all controllers as before. The LED being solid on still indicate that an error occurred. Holding the switch 10 sec will factory reset the adapter to default config and clear the Bluetooth keys.

See v0.18 release.