I have a 4S running 6.1.2 JB'd, but something appears to be corrupted with a few of the settings. I need to 'restore', but somehow continuing back to 6.1.2 where I can JB. I thought of perhaps doing the 'Erase device content & settings,' but I'm not sure if this will work? I have read mixed reports that JB'd devices will go into a boot loop. Any ideas?