Downgrade Oneplus 9 To Android 11 Jun 2026

, which is a specialized utility for unbricking and deep downgrades via a Windows PC. This requires a computer and puts the phone into "EDL mode" by holding both volume buttons while connecting it via USB. Oneplus 9 Pro | Downgrade to OXYGEN OS 11

Move this file to the of your phone's internal storage (do not put it in any folder). Enable Local Upgrade Downgrade Oneplus 9 To Android 11

Download the official OOS 11 downgrade ZIP for your region from OnePlus’s servers: , which is a specialized utility for unbricking

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 Enable Local Upgrade Download the official OOS 11

Now that you're prepared, let's dive into the step-by-step guide: