Before you touch a single file, understand these three non-negotiables:
This process will completely and irreversibly wipe all data on your phone. Ensure you have a full backup stored on a PC or cloud service before proceeding. Phase 1: Preparation Check Battery: Ensure your device has at least 50% charge . Download Required Files:
: Download the official Android 11 rollback ZIP specific to your region (Global, India, or EU) from the OnePlus Community forums .
Copy the rollback ZIP file to the root of your internal storage (not inside any folder). Then, install the OnePlusLocalUpdate_for_Android12.apk (this is the hidden system updater). Open the app, select the ZIP file, and confirm.