Downgrade Oneplus 9 To Android 11 ((link))

Ensure your OnePlus 9 has at least 60% battery charge to prevent the phone from powering off mid-process.

: Download the specific OxygenOS 11 rollback ZIP for your region (IN, NA, or Europe) from the official OnePlus Community . Step 1: Install the Local Update Tool

You need the specific rollback package tailored for your region and model.

To prevent your OnePlus 9 from immediately upgrading back to Android 12 or 13, you must disable automatic over-the-air (OTA) updates. Go to and tap System .

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Downgrade Oneplus 9 To Android 11

Before you begin the downgrade process, make sure you:

If you run into any specific issues during the installation, let me know:

The System Update App Says "Verification Failed" or "File Incompatible" This typically happens for two reasons:

This process will completely wipe your device. You must back up all internal storage, photos, contacts, and app data before moving forward. Ensure your OnePlus 9 has at least 60%

A toast notification will confirm: "You are now in Developer Mode!" Step 3: Install the Rollback Package

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

How to Downgrade OnePlus 9 to Android 11 (OxygenOS 11) – Comprehensive Guide

: Download the specific rollback package for your model (NA, IN, or EU) to avoid regional compatibility errors. To prevent your OnePlus 9 from immediately upgrading

If you are facing performance degradation or prefer the original software experience, this guide will help you . ⚠️ Crucial Disclaimer & Prerequisites

If the ROM file ends in .jar or .zip.j , rename it to remove the extra extension so it ends only in .

While the initially received praise for its flagship performance, many users eventually found that newer updates—specifically Android 12 and 13—introduced bugs, battery drain, or UI changes that felt less "OxygenOS" and more like Oppo's ColorOS. If you're missing the stability and sleekness of the original software, this guide will walk you through how to downgrade your OnePlus 9 to Android 11 (OxygenOS 11) . Important: Read Before Proceeding