It is always a good idea to take a backup of your iPhone, iPad and iPod Touch before updating it with the latest iOS software update.  You can back up your iOS device using iTunes or iCloud



iOS
(Compatibility)

Please
note iOS 9 is available as a free upgrade for the following iOS devices:
·        
iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c,
iPhone 5 and iPhone 4s
·        
iPad Air 2, iPad Air, iPad 4, iPad 3 and iPad 2
·        
iPad mini 3, Retina iPad mini, 1st gen iPad
mini
·        
6th generation iPod touch, 5th generation iPod touch


Backup your iOS Device:
It is always a good idea to take
a backup of your iPhone, iPad and iPod Touch before updating it with the latest
iOS software update. 
You can back up your iOS device using
iTunes or iCloud


How to install iOS
9 update wirelessly Over the Air (OTA):
Before you start the download, make sure that your iDevices have enough
charge for update. Once you are plugged in and connected via Wi-Fi, open the
Settings app and tap on General > Software Update. iOS will
automatically check for available updates and will inform you that iOS 9.2 software
update is available.
It is always a good idea to take a backup of your iPhone, iPad and iPod Touch before updating it with the latest iOS software update.  You can back up your iOS device using iTunes or iCloud

Tap Download to download the update. Wait for the download to complete
and then tap Install to apply the update. Your iPhone or iPad will
continue to download the update and will send you a notification when the
update is ready.  Go back to Settings > General > Software
Update
 and then tap Install Now to install the now downloaded iOS
update file.

How
to install iOS 9 update using iTunes:

Before
you plug in your iOS device. take a moment to make sure you are using the
latest version of iTunes. Click on iTunes in the menu bar and then click on
“Check for updates.”
Once iTunes is
all squared away, it’s time to turn your attention to your iOS device and
follow these instructions:
Step
1:
 Connect your iOS device to your computer using an USB
cable. Wait for iTunes to open and connect to your device.


Step
2:
 Click on device button to the left of the iTunes Store
button in the top right corner in iTunes.

Step 3: Click on the “Check for Update” directly
without using holding down on the Option key or the Shift key. If the iOS 9
update is available it will automatically download and update your device to
iOS 9.
It is always a good idea to take a backup of your iPhone, iPad and iPod Touch before updating it with the latest iOS software update.  You can back up your iOS device using iTunes or iCloud
Step
4:
 You will get a popup message informing you the new update
is available. Click on Download and Update button. 


Step
5:
 If you want to update to iOS
9 manually using IPSW file then Download the firmware file for your device from
the download link below:


Download
iOS 9 IPSW
Here are
the direct links to download iOS 9 IPSW for iPhone, iPad and
iPod Touch:
iOS 9
Download links for iPhone:
·         iPhone 6
·         iPhone 6 Plus
·         iPhone 5s (Model A1453, A1533)
·         iPhone 5c (Model A1456, A1532)
·         iPhone 5 (Model A1428)
·         iPhone 5 (Model A1429)
·         iPhone 4s
iOS 9
Download links for iPad
·         iPad Air 2 (Model A1566)
·         iPad Air 2 (Model A1567)
·         iPad mini 3 (Model A1599)
·         iPad mini 3 (Model A1600)
·         iPad mini 3 (Model A1601)
·         iPad Air (Model A1474)
·         iPad Air (Model A1475)
·         iPad Air (Model A1476)
·         iPad mini 2 (Model A1489)
·         iPad mini 2 (Model A1490)
·         iPad mini 2 (Model A1491)
·         iPad mini (Model A1432)
·         iPad mini (Model A1454)
·         iPad mini (Model A1455)
·         iPad Wi-Fi (3rd generation)<
·         iPad 2 Wi-Fi (Rev A)
·         iPad 2 Wi-Fi
·         iPad 2 Wi-Fi + 3G (GSM)
·         iPad 2 Wi-Fi + 3G (CDMA)
iOS 9
Download Links for iPod touch
·         iPod touch (5th generation)
·         iPod touch (6th generation)
After
downloading the firmware file, hold the Option key (Mac) or the Shift key
(Windows) and click on the “Check for Update”. 
Step 6: You will get a popup message informing you that iTunes will update your
iPhone/iPad/iPod touch to iOS 9.2 and will verify with Apple. Click on
the Update button.
Step 7: iTunes will now begins extracting & updating iOS 9.2 firmware.
Step 8: Do not disconnect your device until the update has
finished. It can take a few minutes. Your device will be updated to iOS 9.2 and
it might reboot once or twice during the process. You will see while Hello
screen after it is successfully update. Follow the on-screen instructions to
start using the device.
Enjoy iOS 9.2 with its features .
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