iPhone cannot be updated an unknown error-1
When I tried to update after restoring iPhone 4s, till 60% it's updating after that unknown error occurs
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@nithinrosh -1 is usually indicative of a failed Baseband (IMEI). You do want to try a few things like:
Use the back USB port on your computer (do not use a hub etc. Depends on your computer of course)
Use an Apple brand charger
Use an Apple brand cable
Clear your computer’s DNS cache (depends on OS and computer)
Restore in DFU mode
Some suggestions other made is a new battery as well as using a different computer. Also, instead of trying iTunes check on 3utools for a restore.
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