Most developers have not released dedicated custom ROMs for the Vivo Y1s (model PD2014F) due to the restricted nature of Vivo’s Funtouch OS and the MediaTek MT6765/MT6771 chipset.
Attempting to force a custom ROM onto a Vivo Y1s comes with significant risks: vivo y1s custom rom
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 Most developers have not released dedicated custom ROMs
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. vivo y1s custom rom