initially rooted, and then accidently deleted some main apk and mobile not opening

I have Infocus M2 3G, and rooted it some time ago via king root app.
then i installed the Titanium backup and accidentally deleted some imp. system app via titanium backup.

Now when i rebooted my mobile, it only opening the infocus introductory screen and then again rebooted itself again.... same process happening again and again.

Please help me. ASAP