Realme has begun its rollout of the December 2021 OTA Update for Realme C20 devices. And also brings noticeable improvements in system performance and stability. This carries RMX3061PU_11.A.56 build, although there is nothing major apart from bug fixes.
As this update doesn't bring the latest security patch, it has the November 2021 Security Patch, which was released last month with A.55 Build number, and we don't have any information regarding the android 11 update yet. It looks like Realme is focused on current Flagships & Popular budget segment devices for Major Update.
Realme C20 was released on January ,2021 with Android 10 Realme UI 1.0
Previous update: Realme C20: November 2021 Security Patch with A.55 Build

Source: Realme Community
| Android OS | Update | Release Date/Status | Estimated Months |
| Android 10 | Out-of-the-box | January 2021 | Nil |
| Android 11 | First OS update | Not yet received | unconfirmed |
| Android 12 | Second/Last OS update | – | – |
The Realme C20 came with Android 10 out-of-the-box and it’s anticipated that it receives an Android 11 update, though it’s been a while and we have our doubts whether it will get the Android 11 update or not as Realme has already started working with a beta version of Android 12 for their Flagship Devices.
Check out: Realme Android 12 Update list Based on Realme UI 3.0
Hence, Realme C20 should be eligible for Android 11, but we are sure of the timeline of the update.
Once the update is available on your device, you can head over to Settings >> About Phone >> Software Update section to update your Realme device with the latest security/software update.
For more Android updates please download our Android App – Available on the Play Store