Bluetooth Connect Fails Android Mode as-HID when-BLE

Devices like BlueSnap M6A, and idChamp brand NFC-RFID reader-writer like NF4, RS3, RS4, DX1 have option for multiple Bluetooth modes. Suppose device is connected in HID (keyboard simulation) mode, then later want to change mode and connect to the same Android device (similar issue happens on iOS).

This video shows how to use SerialMagic Gears app on Android to easily clear the Bluetooth cache so device will forget the incorrect Bluetooth mode.