Some common reasons for IMEI issues on the Realme C30s include:

: Users frequently report "Fail" errors during patching if the secure modem cannot be read or if the security patch is too recent (e.g., late 2024/2025 patches). Critical Considerations Functionality Loss

Replacing the original IMEI with a different one. This is illegal in many jurisdictions and is often used to bypass network blacklists or hide stolen hardware.