I have suggested before that the Flash Tool should not have the Backup and restore option marked as default.
Normal users will of cause not fiddle with anything expecting that the default is the correct way to do it.
When you need to flash a new image it's almost always because you have wrecked the one you use at the moment
So to have those settings as default is not a good option and should spare regular users from lots of problem
So if you can get back into rescue mode chris19 Flash the newnigma2 image but this time make sure you
un hock both the backup and restore check boxes before pressing "Go" to flash the image.