Help! I thing that i delete a file system and Mi2 don't work...

Dec 22, 2014
Hi to everyone, i'm new here and i' don't know if the roght palce for may question...
Yesterday i tried to flash a ROM in my MI2s, i used CWM, did a backup, but the new rom didn't run. So i tried to restore the back up, but CWR told me that missing a file (a root, i guess). I triest also to reboot with the system 2, but i had the same message and went in loop.
In the end i used Miflash, but the ROM wnet in loop and now i don't have CWM but the base recovery of Mi2.
Someone could hepl me????