This is where come in. A custom ROM replaces the stock operating system with a cleaner, faster, and more modern version of Android—often based on pure Android (AOSP) or popular skins like LineageOS.

) is famously difficult because Vivo typically does not allow bootloader unlocking for its devices. While official system updates are readily available, third-party "custom" ROMs are rare and often limited to unofficial ports. vivo Official Site Official Stock ROM (Firmware)

. These work on most devices released with Android 9 or higher thanks to Project Treble. Tutorial for Firmware Installation - Vivo