If your provider allows it the beta will show up when you first open the Samsung Members app as a tile across the top and you can look under the benefits tab also. The banner will only show up if your provider is participating in the beta
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This needs to be posted in the beta forum so a beta moderator can help you I can't remember exactly where you would see it but there is an option somewhere to leave the beta
To unregister from the beta, open the beta banner in the Members app. Scroll down until you see the button for leaving the beta. Click that and follow the directions.
Once u withdraw from the beta program u can use Samsung Smart switch software which can be download from Samsung website online or Microsoft store I think or Apple Mac store to downgrade and reinstall one ui 5.1 but will wipe it data.
