First, make sure you are running a
beta version of Android.
View devices to find the device you want to remove and click
Opt out. Your device will receive an update within 24 hours that will wipe all user data and install the latest stable public version of Android.
Applying the update to the latest stable public release requires wiping all locally saved data on your device. You may also encounter issues restoring a backup. You have the option to not install this update. If you choose not to install the update to the latest public build, and your device remains unenrolled from the program, you will automatically receive the next stable release update of the version you’re beta testing when it becomes available to the public. It may take up to 3-4 months to receive the update depending on when during the Beta program cycle you opted out. If you apply the final public release of the beta version you are testing, your device will not get wiped.
Note: During the beta program’s release cycle, there will be stable releases to the public (the official platform release followed by Quarterly Platform Releases (QPRs)). When you apply the stable release update for the version you’re beta testing, you can opt out
without a data wipe for a limited time until you apply the next beta update.