I think I replied to this in the other thread, but............
Redownload the rom and language pack. Reboot into recovery. Connect the phone to the computer and mount the sd card in recovery. Copy the new download of the rom to the sd card. Wipe everything three times (e,g, wipe cache, dalvik, factory data, etc.) Flash thenew rom download file you copied over. That generally fixes it.
(As an alternate, if you have made nandroid backups of previous miui builds, boot into recovery, wipe everything, reload a nandroid backup and get the phone working. Then redownload the rom, boot back into recovery, wipe dalvik and cache and flash the new rom download.)
Good luck, hope that helps!