Most "ROMs" found online for this device are actually Official Stock ROMs used for unbricking or fixing software issues, rather than custom performance-enhancing firmware. Risks and Warnings
Installing a is currently extremely difficult or impossible for most users because Vivo does not officially allow bootloader unlocking . While "generic" guides exist, specific custom firmware builds (like LineageOS or Pixel Experience) are not officially maintained for this specific model. The State of Vivo Y1s Custom ROMs vivo y1s custom rom
If you manage to unlock the bootloader using unofficial third-party tools (like UnlockTool ), you might be able to flash a GSI ROM since the device supports Project Treble. Most "ROMs" found online for this device are