Your rom is tempered rom.
First install xiaomi devel rom fastboot method. Backup your data.
link:
http://en.miui.com/a-234.html
1. Unlock you phone
2. Install TWRP
link:
http://en.miui.com/thread-265035-1-1.html
2. Flash xiaomi eu rom (devel or stable).
Connect your phone with computer install latest drivers from xiaomi or auto install with miflash. Then download latest fastboot and adb from xda. Boot your phone in fastboot. Open cmd in adb folder and insert fastboot code.
Google type: xiaomi forum install twrp
or
Rename TWRP.zip to update.zip copy to root / on internal storage. Start updater app, -> click ... in the right top corner, -> choose update package (update.zip).