Realme has started rolling out June & July 2022 security patches to Realme C15 devices. The latest software update comes with the build number RMX2180_11.C.13 and carries security and system updates that improve system performance in some scenarios.
Realme C15 was released on July 28,2020 with Android 10 out-of the box.

Remember, this is a staged rollout. To ensure there are no critical bugs, they are rolling the update in stages. If no critical bugs are found, the full rollout will be completed in the upcoming days and will reach all the users soon.
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Previously the device had received the May 2022 security patch with C.12 build along with system and stability improvements. Full details of the Changelog: Realme C15: May 2022 Security patch with C.12 Build

Source>> Realme community
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| Android OS | Update | Release Date/Status | Estimated Months |
| Android 10 | Out-of-the-box | July 2020 | Nil |
| Android 11 | First OS update | July 2021 | 9 months |
| Android 12 | Second/Last OS update | Not Eligible | - |
The Realme C15 was released with an Android 10 in July 2020. Therefore, Android 11 is its first and last major OS update.
Sadly we have to say that the Realme C15 device is not eligible for Android 12-based Realme UI 3.0
The Realme C15 Software Update with July 2022 Android Security Patch is being rolled out in phases. Hence, it will reach all the users soon.
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 updates, please download our android app – available on the Play Store