This is documented in the manual:
First Pairing and Device Pairing Reset!
When you first pair the controller or when you need to pair it to a new device you need to reset the Bluetooth bonds!
To do bond reset you need to press and hold the second round button with the controller turned off, then without releasing the button, power the controller and wait 2 seconds.
This will reset the device bluetooth bonds and the controller will be discoverable to connect to a new device.
I only recommend pairing it when you REALLY need to use it by bluetooth, otherwise leave it cable only.
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