Can I update my iPad 1 IOS past 5.1.1

Unfortunately you can only update to 5.1.1 for the ipad1

install netflix on ipad first gen.:
first make sure your iPad 1st. gen is on iOS 5.1.1 !
It is possible, a bit tricky, but possible. First, you'll need to download the Netflix app through iTunes on your computer, this will make it show up as "purchased" in your library. After that, open up the App Store on your iPad 1 and go to the 'purchased' tab. When you try to install it this way it will tell you that you need iOS 6 or higher, but will also ask if you would like to download an older version of the app. then click on download.
- again step by step:
1) Open up iTunes on your computer
2) Go to Store (left hand column) ->iTunes Store
3) Search for Netflix; - download the app
4) then open App Store on your iPad
5) Click on 'Purchased'
- you will have to install NetFlix by clicking on it as usual.
App Store will ask you: "Download an older version of this app. The current version requires iOS 6.0 or later, but you can download the last compatible version.",
then click on Download and it should finally work.

For the iPad first generation (A1219) before iOS 5 to update is only possible with connecting the device to iTunes on a computer. Plug it into your computer and open up itunes under devices click on your ipad and then click on check for update.
- but this model supports only iOS 5
- NO iOS 6/7/8 !

on a 1.gen. iPad it is impossible to install iOS6:
this model supports only iOS 5 !
- NO iOS 6/7/8
- the processor is too slow....
For the iPad first generation (A1219) before iOS 5 to update is only possible with connecting the device to iTunes on a computer. Plug it into your computer and open up itunes under devices click on your ipad and then click on check for update.
- but this model supports only iOS 5
- NO iOS 6/7/8 !

iOS cannot be downloaded with safari
There are two ways to update the iOS version of your iPad 2:
- 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

For the iPad first generation (A1219) to update is only possible with connecting the device to iTunes on a computer.
- this model supports only iOS 5
- no iOS 6/7/8!

iOS is not an app - it is the running system of an iPad and is to be dowloaded from Apple:

- the download depends on the model of your iPad:
For the iPad first generation (A1219) to update is only possible with connecting the device to iTunes on a computer.
- but this model supports only iOS 5
- NO iOS 6/7/8
-------------------
for all other models:
There are two ways to upgrade 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 snce iOS 5, it is possible to upgrade 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

- depends on the iPad model you have:
For the iPad first generation (A1219) before iOS 5 to update is only possible with connecting the device to iTunes on a computer. Plug it into your computer and open up itunes under devices click on your ipad and then click on check for update.
- but this model supports only iOS 5 !
- NO iOS 6/7/8 !
-----------------------------
for all other models:
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

NO
- iOS 6 and higher is not compatible with first gen. iPads!
First gen iPad not getting iOS 6 update Apple confirms

on a iPad 1.gen. iOS 6 is impossible:
this model supports only iOS 5 !
- NO iOS 6/7/8
- the processor is too slow....
For the iPad first generation (A1219) before iOS 5 to update is only possible with connecting the device to iTunes on a computer. Plug it into your computer and open up itunes under devices click on your ipad and then click on check for update.
- but this model supports only iOS 5
- NO iOS 6/7/8 !