Download Vivo Y35A Stock ROM
1- Install Fastboot driver.
2- Run, Mi Flash tool.
3- Switch Vivo Y35A into Fastboot mode.
4- Connect it to PC, using USB cable.
5- Click on refresh, it will show up the device in tool.
6- Click on Browse in Mi Flash tool and select the folder of Firmware.
7- Now, under Browse Click on Advance.
8- In Fastboot Script, select Flash All and click on ok
9- Select Flash.