iTunes Error 1100

Hello Proggerz,

Thanks for choosing the Apple Support Communities. If we understand correctly, you're seeing an error when updating your iPhone using iTunes.

Though this doesn't have the specific error you're mentioning, try following the steps in the article and see if they help.

iOS update and restore errors

Also, here is a great resource on different methods of updating

Update your iPhone, iPad, or iPod touch

Cheers!