On my Redmi 3s in the last weekly flash rom and the smartphone is switched off before finishing.
I switch on, TWRP reflash rom and is successful.
Finally flash root SuperSu-v2.76 and it works.
If you have alredy installed TWRP on the smartphone, turn on Redmi and connect on PC.
Download and install Minimal ADB and Fastboot, copy twrp.img (land) in directory ADB
open shell (shift+mouse right) and write:
fastboot boot twrp.img
smartphone reboot on recovery twrp
In the calculator functionality of % it is wrong?
Example: if I make 100 + 10% gives me 100.1 (% on the calculated directly on the 10)
The correct value (that do other calculators) is 110.