Downgrade Oneplus 9 To Android 11 Exclusive !free! Jun 2026

If you own a T-Mobile OnePlus 9 (model LE2117), the downgrade process has additional complexities. T-Mobile users have reported significant issues with Android 12, including WiFi calling failures where “able to dial call but unable to hear audio from the other party”.

After the process completes:

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