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Sep 23, 2015 1:22 AM in response to Amina Bentoutahby Ingo2711,If you have downloaded iOS9 and the phone is stuck at the "Slide to Upgrade" screen, follow the steps mentioned in this article to restore it back to factory settings, without using a backup afterwards.
If the Slide to Upgrade screen won't go away after you update to iOS 9 - Apple Support
You can't install iOS6 on an iPhone 5s, it came with iOS7 originally installed and downgrading is not supported by Apple.