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Switching to a custom ROM on the Go to product viewer dialog for this item.
Most development for this device occurs in unofficial channels. Because it uses a MediaTek (MTK) chipset, it primarily relies on Generic System Images (GSIs) rather than device-specific custom ROMs. Official Support: vivo y1s custom rom
If you are attempting to develop or flash content for the Y1s, these are the primary tools used in the community: Vivo Y1s 2GB / 32GB, Android 10, Funtouch 10.5 Vivo Y1s 2GB / 32GB, Android 10, Funtouch 10.5. Asianic Distributors Inc. Switching to a custom ROM on the Go
If you only want a faster phone without the risk of bricking: fastboot flash recovery twrp