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I just fix the problem error 1 on iphone5c, and it is simple go here https://ipsw.me and download the latest ios for iphone is very simple it shows everything there just put your device iphone 5c 5s 6 or any one..sorry a bout me english guys! after you have download the latest ios on your computer go to Itunes and push the button shift and restore. It works fine for me.
2Awesome Comments!
For Iphone 4s Restore Error 1
https://discussions.apple.com/thread/6009840
Fix error 1 from Support Apple
https://support.apple.com/en-al/HT201210