So...
1) installed twrp 3.0.2 via fastboot, all ok;
2) wiped everything (data, system, internal storage, cache, dalvick);
3) put "xiaomi.eu_multi_cancro_V7.1.5.0.KXDCNCK_v7-4.4.zip" (i think that this is latest Xiaomi.eu rom KK for cancro, right?) in sdcard via mtp twrp;
4) install zip -> always...