Alex katrich Recommendations for installation:
1) Download the firmware from our site / GDrive to the user’s section or to the SD card
2) Boot into TWRP *, make a Nandroid backup-
3.1) When changing from EEPROM another author on another firmware EEPROM weekly passage with a stable, decreasing firmware (i.e. transition from a more pozdneyna ranyuyu) and the transition sMIUI 9 to 10 MIUI necessarily make purification (wipe) partition cache, ART / dalvik, vendor (if any) and data.
3.2) version of Android is increasing, making clean (wipe) cache partitions, ART / dalvik, data, and format data
3.3) If you are upgrading the firmware version is nothing to clean it is not necessary (except for firmware indicating such a need). At the request of TWRP can be cleaned and Android MIUI folder in the user section (there are tails of all installed, including system, applications).
4) Start the installation process.
* Recommended firmware installation only on a fresh version of TWRP.