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I tried all tutorials and used redsnow/snowbreze but I am unable to update my iPhone 4 to ios 7. the phone is sim-locked (don't use it for call, just for apps and games) and when I start itunes, they recognize it and tell me to enter a proper sim. so I cannot install downloaded ios 7 ipsw.

and if I try to put iphone into itunes mode and then start itunes, they start upgrading but stops each time with error.

I currently have ios 6.1.3 tethered.