Yup. Same over here. I had to restore my iphone twice!
Though I read
here that you need to install
Dynamic Module Loader before you install MivTones.
Quick install:
1)add the source/s above
2)find Dynamic Module Loader (under iFoneTec), dl/install
3)find VideosTone (under System), dl/install
4)find VT Update Pack (under iFoneTec), dl/install
5)respring, then restart iphone
6)go into your settings, scroll all the way to the bottom, select VideosTone
7)choose your video and/or ringtone, then enable VideosTone, it should respring
8)call your iphone to test
Which is probably why the app hung the iphone. It didn't have the support. Cydia is not working for me right now and the ifonetec section is not appearing anywhere.