OnePlus 8 IN2017 Android 13 Update

I have a OnePlus 8Pro, bought from OnePlus, and have had the newest update for quite while now. My girlfriend has a OnePlus 85G.

Her's is the T-Mobile version, but long since paid off. It says it's unlocked, but T-Mobile's ad bloatware is preventing her from getting the update. BTW, the 13 update is in fact stable, & has been for a long time now. T-Mobile should know that it's now illegal to lock these phones in any capacity once they're paid off. She bought hers second hand, it's been paid off for a VERY long time, and the ad-bloatware is what's blocking the update, hence T-Mobile is breaking the law. We are looking into legal action since the phone is still "locked" but preventing updates.