update IOS 10 to IOS 11 for Iphone 5S

Are you sure it is a 5S? The iPhone 5s is compatible with iOS 12. You can only update to the latest iOS for your device. In this case it is iOS 12.2. You cannot update that device to iOS 11. It is no longer approved by Apple.

Hi. Dear brother this is not possible. The reason for this is because when Apple releases an iOS it is valid until the next OS is released. This mean that when iOS 11 was released it was valid until iOS 12. Now since Apple is going to release iOS 12.3 in few weeks then even iOS 12.2 will no longer be available for iPhone.

So in short we can say that you can't update your iPhone 5s to iOS 11 instead you will have to update it to latest possible version of iOS.

I had iPhone 5s. I updated to iOS 11 and i found it slower then after the release of iOS 12 i updated and it became even faster. Speed, Rebooting, wifi, cellular, Apps and all other functions became super faster. I'll prefer you to update iPhone to iOS 12.

Can please post your model number? Begins with A****

As pointed out that should update to iOS 12. What happens when you you try to update the software?