Phone Stuck in Bootscreen

I was trying to install the MIUI ROM, when my phone started showing an error while installing

I got the following error:-
E: Can't mount /cache/recovery/command
E: Can't mount /cache/recovery/log
E: Can't open /cache/recovery/log
E: Can't mount /cache/recovery/last_log
E: Can't open /cache/recovery/last_log

Now when I try to power up my phone I can't go beyond the MI logo. I have XWM installed. I can't even flash the Stock ROM using SP_Flash as it is not detectingmy device. I don't ven have a backup before flashing. What do I do. Please help!!!!!!!!1