Feasibility and Availability of Custom ROMs for vivo 1801 (Y91/Y93 Series)
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
to see if any developers have uploaded device trees or kernel sources.
Feasibility and Availability of Custom ROMs for vivo 1801 (Y91/Y93 Series)
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
to see if any developers have uploaded device trees or kernel sources.