Install TWRP on Redmi 3S/Prime Via Fastboot

- Make sure you've R3S UBL (Unlock Bootloader)

Read : Unlock Bootloader Redmi 3S/Prime

- Redmi 3S android os v6.0 (marshmallow)
- Installer TWRP

Read : Redmi 3S/Prime Tools and Driver

Step:
1. Download and extract the installer TWRP


2. Click "twrp-installer.bat" turn off your R3S, go to fastboot (Vol down + power) then enter, follow the existing command (Anykey = enter), will be automatically entered into TWRP recovery


3. After the slide swipe to allow system modifications -> Click Advanced -> click disable dm-verity, wait for it to finish and then reboot the system
4. done