we will need to find a way to downgrade the andriod version without actually breaking it
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Tough luck, the game would have been long shut down before people find a way to downgrade the Quest 2's firmware (let alone Quest 3, heck even Quest 1.) I'm not even sure the Oculus Go has a functioning downgrade method (even if it did, Meta would force you to update to the latest version during setup, even if you found a way to bypass updating, most features wouldn't function.)