If you want a "stock Android" experience that is stable and reliable, LineageOS is the go-to choice.
Custom ROM development for the is extremely limited due to the device's locked bootloader and its MediaTek Helio P35 (MT6765) chipset . While general Android modifications are possible, a dedicated ecosystem of custom ROMs (like LineageOS or Pixel Experience) does not officially exist for this specific model. Current State of Custom ROMs for Vivo Y1s 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. If you want a "stock Android" experience that
Currently, there are no official builds from major ROM projects (LineageOS, Evolution X, etc.) for the Y1S. GSI Compatibility: Since the device launched with Android 10, it supports Project Treble Current State of Custom ROMs for Vivo Y1s