Realme is rolling out September 2021 Security Patch to Realme C21Y devices with system stability and performance.
Realme C21Y was released was released 02nd July,2021 with Android 10 out-of-the-box.
Realme C21Y is equipped with a 5000 mAh massive battery with a 6.5" mini-drop full screen with an Instant fingerprint Sensor.
This security patch is rolling out to the devices in batches starting 19th October 2021.

Source>>Realme Community
Check Out>> –>> Realme UI 3.0 with Android 12
| Android OS | Update | Release Date/Status | Estimated Months |
| Android 10 | Out-of-the-box | July 2021 | Nil |
| Android 11 | First OS update | August 2021 | 1 month |
| Android 12 | Second/Last OS update | Eligible | Unconfirmed |
The Realme C21Y was released with an Android 10 in July 2021. Therefore, Android 11 is its first major OS update.
Hence, it is eligible for the upcoming Android 12 update and it will be its second/last major OS update. However, it is expected soon.
For more Realme Android updates please download our Android App – Available on the Play Store