Please be aware that all data will be wiped during the revert-back process, so do remember to backup your data in advance.

[HERE] to Internal storage. Download the roll-back build providedto Internal storage.

Shut down your device and enter recovery mode by long pressing the Power + Volume Down key simultaneously.

Select “Install from Local” and choose the downloaded build to install.

Reboot your device after installing the build. You have to re-enter recovery mode to Wipe data cache and Erase everything(Music, pics, etc).