Because the Vivo Y1S runs on a MediaTek Helio P35 (MT6765) chipset, it relies heavily on Project Treble. Most custom operating systems for this device are installed as Generic System Images (GSIs). 1. LineageOS (GSI)
After unlocking, your device will show a warning message upon every boot. Where to Find Files
In conclusion, the world of custom ROMs for the Vivo Y1s is a goal that, for now, remains out of reach for the vast majority of users. The combination of Vivo's strict security policies and a complete lack of dedicated developer interest means you cannot install a custom ROM like LineageOS or Pixel Experience on your Y1s.
Switching to a custom ROM on the Go to product viewer dialog for this item.
: Perform a "Full Wipe" (Dalvik, Cache, System, and Data).
Some modders hoped for a MediaTek (MTK) exploit. The Y1S uses the . Historically, MTK devices had SP Flash Tool vulnerabilities that allowed bootloader bypasses. However, Vivo pairs its MTK chips with proprietary preloader handshakes. By 2020, most known exploits were patched. Attempts using mtkclient (an open-source tool) on the Y1S generally fail or risk a hard brick.
If you want to optimize your device further, I can provide additional steps. Let me know if you would like me to detail: How to using MTK client tools How to install Magisk for root access on your new ROM How to fix SafetyNet issues for banking apps Which step or guide Share public link
(Optional) If your ROM requires separate Google apps, return to the Install menu, select the GApps zip, and flash it right after the ROM. Step 5: Reboot and Set Up Once the flashing process finishes, tap . Tap Reboot System .
Let’s be honest—it’s not all rainbows.
Given the lack of custom ROMs, here are safer and more practical ways to improve your Vivo Y1s experience.
Get newer Android features not officially released by Vivo.