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Exclusive feedback from our testing lab (OnePlus 9, 8GB/128GB, originally on Android 13):
A warning will appear stating your data will be wiped; tap .
Downgrading a OnePlus 9 device to Android 11 is a relatively straightforward process, but it does come with some risks, including data loss and potential issues with future updates. Before attempting to downgrade, make sure to backup your data and understand the risks involved. Additionally, keep in mind that downgrading may void your warranty, and you may not receive future updates or security patches.
Downgrading your device to a previous version of Android can potentially cause issues with your device's functionality and security. Proceed with caution and at your own risk.