On this page, you will find Vivo Y1s Test Point schematic for force preloader to MTK BROM mode. Test Point allows to boot MTK USB Port or BROM for MediaTek chipset via USB Port.
MTK BROM Test Point for Vivo Y1S
ISP Pinout for Vivo Y1S
Vivo Y1s ISP Pinout allows to direct connect the EMMC chip partition using any JTAG Software Box. It allows to Repair brick partition, dead after flash, reset FRP lock, Pin lock and Password.