Downgrade Oneplus 9 To Android 11 Exclusive [new] Jun 2026
You lose security patches (Android 11’s last security update was February 2023) and newer privacy indicators, but for performance enthusiasts, it is a no-brainer.
I understand you're looking for a feature related to (often called the “downgrade to OOS 11” process). This is a popular request because many users feel OxygenOS 11 was more stable, had better battery life, and fewer bugs than later versions.
Ensure your device has at least 60% battery life to prevent the phone from powering off mid-installation.
After your OnePlus 9 boots into Android 11: downgrade oneplus 9 to android 11 exclusive
OxygenOS 11 represents the final iteration of the clean, lightweight, near-stock Android design that originally made OnePlus famous.
Tap the top-right menu icon and select your local rollback .zip package.
Tap on the Android 11 rollback .zip file you placed in the root directory. You lose security patches (Android 11’s last security
If you decide to proceed, the is your first and safest choice. If that fails or your device is already in trouble, the MSM Download Tool is the ultimate fallback. Whichever method you choose, follow the steps carefully, back up your data, and always double‑check that you have the correct firmware for your specific model and region.
This process will wipe your entire device . Back up all photos, contacts, and files to a PC or cloud storage before beginning.
Acquire the appropriate stable OxygenOS 11 rollback file corresponding directly to your region from the OnePlus Community Rollback Thread : : Official OnePlus 9 NA Rollback ZIP Europe (EU) : Official OnePlus 9 Europe Rollback ZIP India (IN) : Official OnePlus 9 IN Rollback ZIP 2. The OnePlus Local Update App Oneplus 9 Pro | Downgrade to OXYGEN OS 11 Ensure your device has at least 60% battery
OnePlus provides official rollback packages packaged as .zip files. You must download the specific firmware that matches your phone's regional variant. OnePlus 9 OxygenOS 11 Rollback Package Europe (EU): OnePlus 9 OxygenOS 11 Rollback Package North America (NA): OnePlus 9 OxygenOS 11 Rollback Package
To downgrade your to Android 11 (OxygenOS 11), you can follow two primary methods. Both methods will completely wipe all data
Chapter 1 — Prepare like a craftsman
In fact, the problems were so widespread that one OnePlus community user said, “I have to say, nothing improved, no bugs were fixed — battery drain after 40% — random app crashes — screen freeze — keyboards lag over time — 60 hz usage of the phone is unusable — black out screens — nothing improved from the first 12 upgrade”.
Sometimes, flashing an older firmware can cause sensor incompatibilities if the persist partition was corrupted. Perform a full factory reset from the phone’s recovery mode. If the problem persists, you may need to re‑flash the firmware using the MSM tool again, ensuring you have the exact correct package for your region and sub‑model.