anti-rollback works both ways, but is only a hazard when you lock the phone. Thus a rollback to Android just to remove the Google accout, if that is the issue, is expected to be safe as long as you fully respect the Anti rollback if you later decide to lock the bootloader. Further down the linked post are links to three cases of FRP if this is what you have. Fairphone 6 – Unable to Set PIN After Installing /e/OS 3.0.2 - #13 by aibd
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