In the reference manual (via support page), find the instructions for HID (Human Interface Device Mode) under “RS507 Bluetooth Connection Using HID and SPP Profiles”. There are instructions to:
- Remove battery.
- Hold down “Restore” key.
- Replace battery.
- Wait 5 seconds until chirps and tritone.
- Release the “Restore” key.
- Scan the HID bar code from the manual and wait for chirps.