Because Vivo does not officially support bootloader unlocking for most older Y-series models, "official" custom ROMs (like LineageOS or Pixel Experience) are rarely available specifically for this model. However, you can often use if your device supports Project Treble. Prerequisites & Risk Warning

Yes, for the first installation to unlock the bootloader and flash TWRP. Once TWRP is installed, you can flash ROMs directly from the phone’s SD card.

The notification light pulsed a slow, rhythmic amber—the universal sign of a device on life support.