Hi
I have received myn question regarding the flashing of the Xiaomi Mi4c. There are many traps that yiu can hit.
In the TWRP the touchscreen sometimes does not responds, because of an little bug in the current TWRP recovery.
Just try the following:
1. Enter TWRP recovery by pressing Power + VolUp keys for > 20 Sec.
2. Try if touchscreen is responding, if not go on with step 3
3. Switch off and on the the display by using the power button - report IF(!) that does not work
4. Wait ~10 Minutes (yes, really that works) and try again to use your touchscreen.
In my case, the patience was solving the issue ;-)