Fingerprint sensor wont work

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I just unlocked phone, but it wont load into system and saying "cant mount system blabla". Then i installed xiaomi eu via fastboot, setting it normally and tried to add fingerprint - got error. Tried to calibrate it via engineering menu - same error. Also tried to flash persist.img via TWRP and terminal with some commands found in internet but that also not worked. Any ideas how to fix?