i had a mi4 with mirecovery and xiaomi.eu 5.10.xx
i installed by update for 2 times famous 5.12.17
all ok
i installed twrp cancro "process failure" at 99%
i entered inside mirecovery and tryed to load the partition2
FASTBOOT mode.
Now i can fastboot or enter in TWRP (0.o)
if i try to reinstall...