Depends on your definition of "Damage", and also depends on how you achieved beta-testing Android 13 QPR1 Beta 1. If you opted into the Beta program
and received the automatic OTA, then you'll have to visit the site again, opt out of the Beta program, but be aware that this will factory reset your device.
If you opted in but you manually flash (without wiping) the Stable Android 13, 1) There may be issues as a full wipe is always recommended when downgrading. QPR1 Beta 1 -> Stable is a downgrade, so if you don't wipe, you can expect some things to not work correctly. 2) You would receive the OTA to the Beta again at some point.
If you manually flashed QPR1 Beta 1 without opting into the Beta program, then just manually flash the stable Android 13 from:
Pixel 6 Pro latest image:
|13.0.0 (TP1A.220905.004, Sep 2022)||Flash||Link||4dba4ced0ea829e3d334dee55d8b15daa4cd1b57848417a8787d68a0b6ce3793|
Again, if you don't wipe (by removing the "-w" from the Flash-All.bat), then don't be surprised if it doesn't work correctly. It's even possible the phone won't boot correctly.
You can also always use Official Google Android Flash Tool
(OEM Unlocking needs to be toggled on - you may not have to manually unlock the bootloader - the "site" will do that on its own).
Check the box for Wipe, you could go ahead and check the box for Force Flash All Partitions if you feel like it (will wipe, too), and uncheck the option to relock the bootloader when done. The Official Google Android Flash Tool
is the easiest way to flash. I prefer the factory image because I like to get my hands a little dirtier.
If you don't wipe when re-flashing Stable, and the phone doesn't work correctly, it won't be damaged - just factory reset the phone (or re-flash while allowing it to wipe), and it'll be good.