Here’s interesting and useful content regarding custom ROMs for the Vivo Y1s (model: PD1731F) — a budget device with MediaTek MT6765 (Helio P35) and 2GB RAM.
Step 2: Boot to Fastboot Turn off the Vivo Y1s. Press Volume Down + Power until you see the Fastboot logo. vivo y1s custom rom
Stay on Stock ROM if: