Downgrade Oneplus 9 To Android 11 Exclusive Jun 2026
fastboot delete-logical-partition system_a fastboot delete-logical-partition system_b fastboot delete-logical-partition product_a fastboot delete-logical-partition product_b fastboot delete-logical-partition vendor_a fastboot delete-logical-partition vendor_b
: Ensure your OnePlus 9 has at least 60% battery life to prevent shutdowns mid-process.
Ensure your OnePlus 9 has at least 60% battery life to avoid shutdown during installation.
You cannot downgrade via a standard "Over-the-Air" (OTA) update. The downgrade process requires using a local installation package (MSM Tool or OxygenOS ZIP) that wipes your device completely. downgrade oneplus 9 to android 11 exclusive
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This process will completely wipe your device. It performs a factory reset that erases all photos, apps, messages, and settings.
Scroll down to find and toggle the switch to the OFF position. The downgrade process requires using a local installation
Ensure the downloaded file ends with a .zip extension. If your browser appends .jar to the end of the file, rename it to remove the .jar suffix. Step 2: Transfer the Firmware to Your Phone
Downgrading your OnePlus 9 to Android 11 may:
If you decide that Android 12 or newer eventually becomes stable enough for your needs, you can always upgrade again. But for now, enjoy the speed, stability, and customization options of Android 11 on your OnePlus 9. You made the right choice. If you share with third parties, their policies apply
If local update consistently fails, switch to the MSM Download Tool method described above.
Downgrading your operating system is a destructive process. It wipes your device entirely. Before proceeding, complete these essential steps:
Before you download any files or press any buttons, you must prepare your device. Failing to do so can result in permanent data loss or a bricked phone.
(rename APK):
