Realme has started the incremental rollout of the April 2022 security patch via OTA for the Realme C11 - 2021 model. The latest build number RMX2185_11_A.73 fixes security & system issues. It integrates the April 2022 Android security patch.
Realme C11 was released in June 2021 with an Android 11 out-of-the-box.
The update will be randomly pushed out to a limited number of users today and will have a broader rollout in the upcoming days after making sure there are no critical bugs. If no critical bugs are found, the full rollout will be completed in a few days.
It sibling or almost same version has received the April 2022 Security Patch with A.105 Build, Sometimes it is confusing as both the devices are similar with minor change in version check out: Realme C11: April 2022 Security Patch with A.105 Build

Source>> Realme community
| Android OS | Update | Release Date/Status | Estimated Months |
| Android 11 | Out-of-the-box | June 2021 | Nil |
| Android 12 | First OS update | Eligible – No info | – |
| Android 13 | Second/Last OS update | Might be Ineligible | – |
The Realme C11 2021 was released with an Android 11. Therefore, the Android 12 should be its first major OS update however there’s no news on it yet, and most probably the device won’t get it now.
Also, it is ineligible for the upcoming Android 12 update and it will not get any major OS update.
Once again, this is a phased rollout and will be available to all the users very soon. Kindly be patient and wait for the update on your device.
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 Realme Android updates please download our android app – available on the Play Store