Hi rrallye,
You have two possibilities, for each you should have a backup of your data.
First you can flash latest MIUI V6 zip by Xiaomi.eu or sMIUI via your custom recovery.
Or you can flash it via miflash or MiPcSuite, but it will wipe all your device (including your sdcard storage !)
Please note that MIUI 6 overwrite your custom recovery. If you want your recovery back, you should use adb command "fastboot oem unlock" to unlock the bootloader
Envoyé de mon MI 2S en utilisant Tapatalk