I have a Oneplus phone which has a beta version of Android installed. I side-loaded it a couple of years ago from the official source (Oneplus website). I don’t remember if it received any further updates, I think it didn’t. I don’t know how to revert back to a stable release. It has been working without any problems. I now want to give the phone away, so I need to factory reset it. Are there any risks to resetting a phone that runs a beta version of Android? Can resetting brick it?

Thanks for any and all advice!