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Switching from stock software to a custom ROM completely transforms your user experience.

For those brave enough to try, the "story" typically follows these milestones:

fastboot flash recovery twrp.img

After scouring XDA Developers, 4PDA, and Telegram groups, these are the most reliable custom ROMs for the Vivo Y1S as of 2025.

Given the lack of custom ROMs, here are safer and more practical ways to improve your Vivo Y1s experience.

Installing a custom ROM or GSI on your Vivo Y1S is an excellent weekend project to maximize the value of your hardware. By transitioning to a lightweight interface like LineageOS or Pixel Experience, you can easily bypass the heavy resource demands of Funtouch OS and extend the usable lifespan of your smartphone.

Seamlessly integrate tools like Magisk for systemless root privileges, modules, and advanced device control. Important Prerequisites and Risks

Press and hold the buttons simultaneously until the Fastboot screen appears.

Thanks to Google’s Project Treble, any device that launched with Android 8.0 or higher can boot a GSI. As long as your bootloader is unlocked and you use a GSI matching your system architecture (usually ARM64 for modern devices), you can run popular ROMs seamlessly. Popular GSI Options for Vivo Y1S:

The first boot will take 5–10 minutes. Be patient.

Move the downloaded ROM image file to your ADB and Fastboot folder on your PC and rename it to system.img .

If you want a feature-rich ROM that looks modern but offers tons of customization, Evolution X is a fan favorite.