I am a legitimate dev who updated to iOS7 yesterday. Although i love the new look it is still way too buggy for me to use until my company buys us new iphone 5's to use as dev units. I tried downgrading using dfu on my iMac and my mac mini on the mini i get an error code 21 and on my imac i get error code 14......everytime. i can restore back to 7.0 no problem, i even tried to just click on restore without directing to a file and itunes says the file that downloaded was corrupted, i dont get it!!! Any help will be appreciated.