iOS 8, the world's most advanced mobile operating system releases Wednesday, 17th September 2014, packed with over hundred new features. These are the instructions on how to get this update this week on your current iPhone, iPod Touch & iPad.
To know what's new in iOS 8, visit : http://www.apple.com/ios/
WARNING : Don't perform any of the below mentioned steps if you need jailbreak and is totally dependent on hardware unlock techniques. this update is not for you. updating to iOS 8 will update the baseband (Modem Firmware) ruining the chances to get an unlock in the future. same warning for jailbreakers. you have to live without jailbreak for next couple of months.
Also iPhone 4S users should hold back and wait for other people reviews on iOS 8 as this update may ruin the performance of your phone. Once you update, there is no going back to iOS 7.
Supported Devices List :
iPhone 4S
iPhone 5
iPhone 5c
iPhone 5s
iPod Touch 5th Generation
iPad 2
New iPad (iPad 3)
iPad with Retina Display (iPad 4)
iPad Air
iPad Mini
iPad Mini with Retina Display
Please note that iOS 8 comes pre-installed on newer devices such as iPhone 6 & iPhone 6 Plus.
How To Update iOS 8 Through iTunes :
Step 1 : Update the version of iTunes and stay up to date. Download the new update by running Apple Software Update on your Mac & Windows based computers OR download the file from apple.com/itunes
11.4 is the latest version and this is a must to have if you want to restore iOS 8 without errors. iTunes 11.4 is now fully compatible with iOS 8.
Download from here : http://support.apple.com/downloads/
Step 2 : Connect your iDevice via USB and run iTunes.
Step 3 : You will be prompted for the update if your iTunes recognizes that new update is available. click on "Download & Update" OR "Download Only" buttons accordingly.
Step 4 : if iTunes does not prompt you, select your device under Devices section and be on the Summary tab. click on "Check for Update" button and iTunes will prompt you for the update.
Step 5 : Download the firmware and wait for the download to complete. only then restore takes place. be patient.
Make sure to take backup before you download & restore your iDevice. you can Backup your device by right clicking on your connected device and selecting "Backup"
How To Update iOS 8 Through OTA Updates (Over-The-Air Updates)
NOTE : if you don't get any OTA update on your device then wait patiently and keep trying. Apple rolls out the update to the millions of devices at once so expect few delays.
This is for iOS 5, iOS 6 & iOS 7 users only. Please note that you shouldn't do this if your device is currently jailbroken on any iOS 5, iOS 6 or iOS 7 version. it simply won't work as OTA updates are broken on jailbroken devices.
Step 1 : Launch Settings app from your HomeScreen
Step 2 : Go To General>Software Update
Step 3 : Make sure you are connected to a Wi-Fi network and not EDGE/3G/4G. OTA updates only works on Wi-Fi.
Step 4 : Once the new update is detected, tap on "Download & Install" button and agree to Terms & Conditions if prompted.
Step 5 : your device will reboot after the successful download & update.
NOTE : Those who do not wish to download complete iOS 8 firmware on iTunes, we have direct links for you straight from Apple servers. be sure to backup your device on iTunes first.(use Shift+Update OR Shift+Restore method to restore these firmware files on iTunes)
Direct Download Links :
iPhone 4S : http://appldnld.apple.com/iOS8/031-05612.20140917.FB40v/iPhone4,1_8.0_12A365_Restore.ipsw
iPhone 5 (GSM) (Model No. A1428) : http://appldnld.apple.com/iOS8/031-05342.20140917.ZPfIL/iPhone5,1_8.0_12A365_Restore.ipsw
iPhone 5 (GSM+CDMA) (Model No. A1429) : http://appldnld.apple.com/iOS8/031-05524.20140917.0wBls/iPhone5,2_8.0_12A365_Restore.ipsw
iPhone 5c (GSM) : http://appldnld.apple.com/iOS8/031-05607.20140917.0Rk5V/iPhone5,3_8.0_12A365_Restore.ipsw
iPhone 5c (GSM+CDMA) : http://appldnld.apple.com/iOS8/031-05340.20140917.F1SK7/iPhone5,4_8.0_12A365_Restore.ipsw
iPhone 5s (GSM) (Model No. A1533) : http://appldnld.apple.com/iOS8/031-05671.20140917.dyJlj/iPhone6,1_8.0_12A365_Restore.ipsw
iPhone 5s (GSM+CDMA) (Model No. A1530) : http://appldnld.apple.com/iOS8/031-05446.20140917.vuup2/iPhone6,2_8.0_12A365_Restore.ipsw
iPod Touch 5th Generation : http://appldnld.apple.com/iOS8/031-05528.20140917.Z5pDb/iPod5,1_8.0_12A365_Restore.ipsw
iPad 2 (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05398.20140917.9eo9l/iPad2,1_8.0_12A365_Restore.ipsw
iPad 2 (GSM) : http://appldnld.apple.com/iOS8/031-05482.20140917.MUK6P/iPad2,2_8.0_12A365_Restore.ipsw
Revised iPad 2 : http://appldnld.apple.com/iOS8/031-05640.20140917.HFZpj/iPad2,4_8.0_12A365_Restore.ipsw
iPad 3 (Wi-Fi) : http://appldnld.apple.com/iOS7.1/031-4805.20140627.zW4AC/iPad3,1_7.1.2_11D257_Restore.ipsw
iPad 3 (GSM) : http://appldnld.apple.com/iOS8/031-05593.20140917.3iAlm/iPad3,3_8.0_12A365_Restore.ipsw
iPad 4 (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05409.20140917.ygg87/iPad3,4_8.0_12A365_Restore.ipsw
iPad 4 (GSM) : http://appldnld.apple.com/iOS8/031-05562.20140917.E0S9Y/iPad3,5_8.0_12A365_Restore.ipsw
iPad 4 (GSM+CDMA) : http://appldnld.apple.com/iOS8/031-05346.20140917.76T9G/iPad3,6_8.0_12A365_Restore.ipsw
iPad Air (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05508.20140917.uXvIg/iPad4,1_8.0_12A365_Restore.ipsw
iPad Air (Wi-Fi+4G) : http://appldnld.apple.com/iOS8/031-05594.20140917.kypBi/iPad4,2_8.0_12A365_Restore.ipsw
iPad Mini (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05420.20140917.KAV4c/iPad2,5_8.0_12A365_Restore.ipsw
iPad Mini (GSM) : http://appldnld.apple.com/iOS8/031-05464.20140917.Y3zCS/iPad2,6_8.0_12A365_Restore.ipsw
iPad Mini (GSM+CDMA) : http://appldnld.apple.com/iOS8/031-05356.20140917.F2YLb/iPad2,7_8.0_12A365_Restore.ipsw
iPad Mini 2 (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05485.20140917.2eDW4/iPad4,4_8.0_12A365_Restore.ipsw
iPad Mini 2 (Wi-Fi+4G) : http://appldnld.apple.com/iOS8/031-05386.20140917.bcrCf/iPad4,5_8.0_12A365_Restore.ipsw
For any more queries or questions, use the comments section.
To know what's new in iOS 8, visit : http://www.apple.com/ios/
WARNING : Don't perform any of the below mentioned steps if you need jailbreak and is totally dependent on hardware unlock techniques. this update is not for you. updating to iOS 8 will update the baseband (Modem Firmware) ruining the chances to get an unlock in the future. same warning for jailbreakers. you have to live without jailbreak for next couple of months.

Also iPhone 4S users should hold back and wait for other people reviews on iOS 8 as this update may ruin the performance of your phone. Once you update, there is no going back to iOS 7.
Supported Devices List :
iPhone 4S
iPhone 5
iPhone 5c
iPhone 5s
iPod Touch 5th Generation
iPad 2
New iPad (iPad 3)
iPad with Retina Display (iPad 4)
iPad Air
iPad Mini
iPad Mini with Retina Display
Please note that iOS 8 comes pre-installed on newer devices such as iPhone 6 & iPhone 6 Plus.
How To Update iOS 8 Through iTunes :
Step 1 : Update the version of iTunes and stay up to date. Download the new update by running Apple Software Update on your Mac & Windows based computers OR download the file from apple.com/itunes
11.4 is the latest version and this is a must to have if you want to restore iOS 8 without errors. iTunes 11.4 is now fully compatible with iOS 8.
Download from here : http://support.apple.com/downloads/
Step 2 : Connect your iDevice via USB and run iTunes.
Step 3 : You will be prompted for the update if your iTunes recognizes that new update is available. click on "Download & Update" OR "Download Only" buttons accordingly.
Step 4 : if iTunes does not prompt you, select your device under Devices section and be on the Summary tab. click on "Check for Update" button and iTunes will prompt you for the update.
Step 5 : Download the firmware and wait for the download to complete. only then restore takes place. be patient.
Make sure to take backup before you download & restore your iDevice. you can Backup your device by right clicking on your connected device and selecting "Backup"
How To Update iOS 8 Through OTA Updates (Over-The-Air Updates)
NOTE : if you don't get any OTA update on your device then wait patiently and keep trying. Apple rolls out the update to the millions of devices at once so expect few delays.
This is for iOS 5, iOS 6 & iOS 7 users only. Please note that you shouldn't do this if your device is currently jailbroken on any iOS 5, iOS 6 or iOS 7 version. it simply won't work as OTA updates are broken on jailbroken devices.
Step 1 : Launch Settings app from your HomeScreen
Step 2 : Go To General>Software Update
Step 3 : Make sure you are connected to a Wi-Fi network and not EDGE/3G/4G. OTA updates only works on Wi-Fi.
Step 4 : Once the new update is detected, tap on "Download & Install" button and agree to Terms & Conditions if prompted.
Step 5 : your device will reboot after the successful download & update.
NOTE : Those who do not wish to download complete iOS 8 firmware on iTunes, we have direct links for you straight from Apple servers. be sure to backup your device on iTunes first.(use Shift+Update OR Shift+Restore method to restore these firmware files on iTunes)
Direct Download Links :
iPhone 4S : http://appldnld.apple.com/iOS8/031-05612.20140917.FB40v/iPhone4,1_8.0_12A365_Restore.ipsw
iPhone 5 (GSM) (Model No. A1428) : http://appldnld.apple.com/iOS8/031-05342.20140917.ZPfIL/iPhone5,1_8.0_12A365_Restore.ipsw
iPhone 5 (GSM+CDMA) (Model No. A1429) : http://appldnld.apple.com/iOS8/031-05524.20140917.0wBls/iPhone5,2_8.0_12A365_Restore.ipsw
iPhone 5c (GSM) : http://appldnld.apple.com/iOS8/031-05607.20140917.0Rk5V/iPhone5,3_8.0_12A365_Restore.ipsw
iPhone 5c (GSM+CDMA) : http://appldnld.apple.com/iOS8/031-05340.20140917.F1SK7/iPhone5,4_8.0_12A365_Restore.ipsw
iPhone 5s (GSM) (Model No. A1533) : http://appldnld.apple.com/iOS8/031-05671.20140917.dyJlj/iPhone6,1_8.0_12A365_Restore.ipsw
iPhone 5s (GSM+CDMA) (Model No. A1530) : http://appldnld.apple.com/iOS8/031-05446.20140917.vuup2/iPhone6,2_8.0_12A365_Restore.ipsw
iPod Touch 5th Generation : http://appldnld.apple.com/iOS8/031-05528.20140917.Z5pDb/iPod5,1_8.0_12A365_Restore.ipsw
iPad 2 (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05398.20140917.9eo9l/iPad2,1_8.0_12A365_Restore.ipsw
iPad 2 (GSM) : http://appldnld.apple.com/iOS8/031-05482.20140917.MUK6P/iPad2,2_8.0_12A365_Restore.ipsw
Revised iPad 2 : http://appldnld.apple.com/iOS8/031-05640.20140917.HFZpj/iPad2,4_8.0_12A365_Restore.ipsw
iPad 3 (Wi-Fi) : http://appldnld.apple.com/iOS7.1/031-4805.20140627.zW4AC/iPad3,1_7.1.2_11D257_Restore.ipsw
iPad 3 (GSM) : http://appldnld.apple.com/iOS8/031-05593.20140917.3iAlm/iPad3,3_8.0_12A365_Restore.ipsw
iPad 4 (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05409.20140917.ygg87/iPad3,4_8.0_12A365_Restore.ipsw
iPad 4 (GSM) : http://appldnld.apple.com/iOS8/031-05562.20140917.E0S9Y/iPad3,5_8.0_12A365_Restore.ipsw
iPad 4 (GSM+CDMA) : http://appldnld.apple.com/iOS8/031-05346.20140917.76T9G/iPad3,6_8.0_12A365_Restore.ipsw
iPad Air (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05508.20140917.uXvIg/iPad4,1_8.0_12A365_Restore.ipsw
iPad Air (Wi-Fi+4G) : http://appldnld.apple.com/iOS8/031-05594.20140917.kypBi/iPad4,2_8.0_12A365_Restore.ipsw
iPad Mini (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05420.20140917.KAV4c/iPad2,5_8.0_12A365_Restore.ipsw
iPad Mini (GSM) : http://appldnld.apple.com/iOS8/031-05464.20140917.Y3zCS/iPad2,6_8.0_12A365_Restore.ipsw
iPad Mini (GSM+CDMA) : http://appldnld.apple.com/iOS8/031-05356.20140917.F2YLb/iPad2,7_8.0_12A365_Restore.ipsw
iPad Mini 2 (Wi-Fi) : http://appldnld.apple.com/iOS8/031-05485.20140917.2eDW4/iPad4,4_8.0_12A365_Restore.ipsw
iPad Mini 2 (Wi-Fi+4G) : http://appldnld.apple.com/iOS8/031-05386.20140917.bcrCf/iPad4,5_8.0_12A365_Restore.ipsw
For any more queries or questions, use the comments section.