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any idea what error 3503 is?

I was updating my iPad to the latest  iOS version and the install crashed. whenever I'm trying to reset the iPad I get a message from after it extracted the firmware that the iPad couldn't be restored and that an unknown error occurred (3503). Any clue ?

Take a look at these articles:

Resolve iOS update and restore errors in iTunes - Apple Support

Get help with iOS update and restore errors - Apple Support

Hello

Thanks a lot for the tip but I tried that already . No luck

Try If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support.

 

tt2

i have same issue with my iphone 6 plus. today i trying to upgrade ios 11. i update my ipad and another iphone without any problem. but my iphone 6 plus still on ios 8.4 error like u. i dont know how to fix it. pls help me if u fixed this error.

I have the same problem with my iPhone 7, trying to restore ios11

i have this problem too, tried to update ipad to ios 11

最后更新：2017-09-25 05:34:07

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