Steam Deck natively recognizes the PS3 controller. Simply plug it in via USB, wait for Steam OS to recognize it, then unplug USB cable and it will work over Bluetooth without needing
Steam Community :: Guide :: How to play with 2 PS3 controllers on 1 BT dongle
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Tutorial] Change Bluetooth MAC Address // SIXAXIS + MontioninJoy + Android | XDA Forums
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Tutorial] Change Bluetooth MAC Address // SIXAXIS + MontioninJoy + Android | XDA Forums