Q: Hi I have i pad model a1337 please anyone tell me how to update my iOS 5.1 to iOS 7.5 or ios8  I am very new to apple I pad thanks

That iPad can't be updated past 5.1.1.

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Click here and try following the instructions. If they're not applicable to an application and you don't already have an older version of it, no.

(123056)

Whatsapp is not available for iPad directly.

For Facebook however:

You may be able to get compatible versions of Apps for the first gen through iTunes on your computer. Download the App you want a compatible version for on iTunes on your computer using the same Apple Id that the iPad has for the App Store. For Paid Apps its best to consult with the App maker to make sure there is a compatible App. With the App Downloaded to iTunes on a computer you can go into The App Store App on your iPad, Tap on Purchased, and Look for the App there. Tap on it to begin the download. It will likely say its not compatible, but if there is a compatible version it will offer to download it.

Install the latest compatible version of an app on an earlier version of iOS or OS X - Apple Support

My partner has my old 1st Gen iPad and it does run a version of the Facebook app on it but it is very glitchy as is using the site via the Safari browser I'm afraid to say. It's quite shocking how quickly the first gen iPad was disregarded by Apple in some respects, released 2010 and less than 5 years down the line well and truly obsolete.

Regards,

Steve