Use the Realme "In-Depth Test" app (if available for your region) to request unlocking permissions. :
Custom ROMs offer a wide range of benefits, including: Realme 8 4g Custom Rom
In Settings > System > Developer Options , toggle on OEM Unlocking and USB Debugging . Use the Realme "In-Depth Test" app (if available
: This is the mandatory first step. It requires using an "In-Depth Test" APK (often specific to your region/UI version) to request permission from Realme to unlock the bootloader. Realme 8 4g Custom Rom