Update ios 5.1 with jailbroken iphone 4s

just go to: http://installmoviebox.com

I would recommend against updating your 4S to iOS 8. If you really want to then I would reset the entire phone (after backup) and then try to update. You can reset the phone to factory by connecting the phone to itunes

depends on the model of iPhone you have:
iOS 6 is possible only on iPhone 3GS / 4 / 4S / 5
iPhone 1 / 2 / 3 are too slow for iOS 6
- There are two ways to update the iOS version of your iPhone, iPad, or iPod Touch - via connecting the device to iTunes on a computer
- or directly from within the device, but only since iOS 5, it is possible to update the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update

- There are two ways to update the iOS version of your iPhone, iPad, or iPod Touch
- via connecting the device to iTunes on a computer
- or directly from within the device,
but only since iOS 5, it is possible to update the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update

to update to iOS 5 is only possible on iPhone 3GS / 4 / 4S with connecting the device to iTunes on a computer.
- Plug the iPhone to your computer and open up iTunes under devices click on your iPhone and then click on check for update.
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latest iOS possible:
iPhone 1 = iOS 3.1.3
iPhone 3 = iOS 4.2
iPhone 3GS = iOS 6.1.6
iPhone 4 = iOS 7.1.2
iPhone 4S = iOS 8.1.2
iPhone 5 = iOS 8.1.2

to update to iOS 5 is only possible on iPhone 3GS / 4 / 4S with connecting the device to iTunes on a computer.
- Plug the iPhone to your computer and open up iTunes under devices click on your iPhone and then click on check for update.
----
latest iOS possible:
iPhone 1 = iOS 3.1.3
iPhone 3 = iOS 4.2
iPhone 3GS = iOS 6.1.6
iPhone 4 = iOS 7.1.2
iPhone 4S = iOS 8.1.2
iPhone 5 = iOS 8.1.2

the latest iOS running on a iPhone 4S is iOS 8.1.2
- There are two ways to update the iOS version of your iPhone, iPad, or iPod Touch - via connecting the device to iTunes on a computer
- or directly from within the device, but only since iOS 5, it is possible to update the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update

to update to iOS 5 is only possible on iPhone 3GS / 4 / 4S with connecting the device to iTunes on a computer.
- Plug the iPhone to your computer and open up iTunes under devices click on your iPhone and then click on check for update.
- latest iOS possible:
iPhone 1 = iOS 3.1.3
iPhone 3 = iOS 4.2
iPhone 3GS = iOS 6.1.6
iPhone 4 = iOS 7.1.2
iPhone 4S = iOS 8.1.2
iPhone 5 = iOS 8.1.2

iPhone 3 can use only iOS 4.2 !
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iOS 5 & 6 is possible only on iPhone 3GS / 4 / 4S
- There are two ways to update the iOS version of your iPhone, iPad, or iPod Touch - via connecting the device to iTunes on a computer
- or directly from within the device, but only since iOS 5, it is possible to update the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update

If your problem concerns your iPhone 3GS (your cellphone), then no, you cannot upgrade it to IOS 7. IOS7 requires an iPhone 4 or newer (4, 4S, 5, 5C, 5S).

If your problem is about your iPad (your tablet), then you can't upgrade if it's an iPad 1. IOS 7 is compatible with the iPad Air, 4, 3, 2, mini and mini with retina display but NOT with the iPad 1.