I got an "Error 7" flashing the wifi fix zip in my Max1 Prime helium.
Now I edited build.prop manually instead, and changed the wifi region from 'RU' to 'GB'.
Just wanted to see if I notice any difference.
I have Nijel8s latest TWRP v323-4, which has always worked flawlessly.
What happened in my Max1 Prime helium when I did this, was that it no longer saw the 149 channel which the Mi Mini router chooses by default for 5GHz wifi.
Changing back to wifi region 'RU' in the Max1, or setting a fixed 5GHz channel (only 36,40,44,48 can be chosen, at least when used as a repeater) in the router solves the problem.
At this point I have no idea what is best to do, long-term that is.
Think I will have to read up on this 5GHz wifi EU situation some more, unfortunately.