Titanium Backup Locks Up When Trying To Restore System Upates (com.samsung.apk)
If your device is full rooted (not just shell rooted), try using Root Explorer app. Mount /system with read-write permission and then paste com.samsung.apk file in /system/app/.

Reboot the device... Done!

Remember to set permissions of the app to rw-r--r-- before rebooting.