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Chrome and Moliza firefox are good, you should try . 

If Wi-Fi is connected, you can upgrade the iOS on iPhone and iPad 8 without a computer or iTunes. Access to Settings> General> Software Update and click on Download and Install iOS in windows 8.
Then, you must agree to the terms of use of Apple and wait for the phone to download the installation file. Up about 1,1GB file on the device, but Apple requires 4,7GB free memory on the iPad mini and iPhone 5s 5,8GB. Installation is complete and restart the computer, you swipe through each page to configure iOS 8 to use.

Why ?