Haizzi moved the zip file to internal storage, and installed it, after that it says unable to mount storage
same when i want to wipe date it says unable to mount storage
After unlocking bootloader did you install TWRP right away? You don't let your phone boot into MIUI?
If that's the case, I think maybe your phone has a boot failure.
Solution now you try to use MiFlash flash China rom (stock rom). Then do it again step by step