You could start by giving us more info, but, chances are that what you restored with BackupMenu depends upon something that was updated by flashing - kernel-power, for instance.

So, your backup should work if you restore it AFTER you've made sure you have the same kernel and software. You'll probably need to flash your way out of the reboot loop, install whatever was missing, and redo the restore from Backupmenu. I recently wrote up that process in another thread, which may be helpful at this point.