Need to update Nubia 255w using apple ipad, what do I do

What iPad do you have? If it's on the minimum required list of apple for iOS 10 you can simply use the system settings app to search for updates and get the updated iOS.
iOS 10 Wikipedia

There are some security fixes in this update along with some new features such as Night Shift so it is recommended to update your devices. You can learn more about what the update contains by visiting:

http://9to5mac.com/2016/03/21/apple-releases-ios-9-3-for-iphone-ipad-and-ipod-touch-featuring-night-shift-touch-id-notes-and-more-here-are-all-the-new-features/

Hope that helps!

if you have laptop/desktop computer you can sync the iPad with iTunes and download iOS 8.1.2 there:
Upgrading iPad to iOS 8: Through iTunes 1. Backup your iPad
Open iTunes. Select your iPad in iTunes and click Back Up Now.
2. Restart your iPad and your Computer
3. Download and Install the Update
Go to iTunes -> Select iPad -> Check for Update -> Click Download and Update

Whichever method you choose, the process will take quite some time to work depending on how much free storage you have on your iPad, your internet connection, and how Apple's servers are doing with upgrades. Occasionally, Apple will either not let you download the upgrade or it will fail. For iOS 8, you must have an iPad 3 or newer. This does not work with the original iPad - if something goes wrong, restart your device, and try again.

How to Upgrade to iOS 7 on an iPad or iPad Mini
How to Install iOS 8 When Your Device is Low on Storage

- 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 since 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

if you have a first gen. iPad you cannot update to iOS 6 as it is only compatible to iPad2 and newer:
First gen iPad not getting iOS 6 update Apple confirms

First Generation iPads can use iOS 5
- but iOS 6 / 7 / 8 need an iPad 2 or newer and are not compatibel with first gen. iPhone
-updates can be made in iTunes connected to a computer or under settings - general - software update
Upgrade iOS from within iOS device
(valid for iOS 5 and above)
Since 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). To upgrade to iOS 6/7/8, simply navigate to Settings > General > Software Update. The screenshot below demonstrates how to do so on an iPad, but this is also valid for the iPhone and iPod Touch.

in iTunes:
How to update to iOS 7

You need to plug the iPad into your computer and run iTunes.
Then perform a "Restore" of the operating system.
See here for more instructions from Apple: http://support.apple.com/kb/HT1414

You can update your iPad to iOS7 as long as it is and iPad 2 model or later. The update can be performed wirelessly or by connecting the iPad to a computer using iTunes.

For step-by-step directions for both methods, check out the Apple website: http://support.apple.com/kb/ht4623

Hope that helps!

Go to... settings

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Aug 20, 2013 • Apple Ipad A1219 16gb Wi-fi