Xiaomi devices come with a locked bootloader for security. You cannot root your device without unlocking it first.
Install the Xiaomi USB Drivers and ADB/Fastboot tools on your PC. Phase 1: Unlock the Bootloader How to root XIAOMI Redmi Y1
: Unlocking the bootloader erases everything on the phone. Back up your photos, contacts, and apps. Xiaomi devices come with a locked bootloader for security
With an unlocked bootloader, flash TWRP. Boot the Redmi Y1 into fastboot mode again. On the PC, open a command prompt in the folder containing the TWRP image file. Execute the command: fastboot flash recovery twrp_riva.img After flashing, do not reboot to the system immediately; Xiaomi’s stock ROM will overwrite TWRP on first boot. Instead, hold Volume Up + Power to boot directly into TWRP. and apps. With an unlocked bootloader