IOS8 those devices can be upgraded _ do not support upgrades IOS8 device type

Q:
Apple which machine can upgrade to IOS8 official edition, which cannot?
A:
The types of devices currently known to upgrade to IOS8 are as follows:
iphone series: Iphone4s, IPhone5, iphone5c, IPhone5S, IPhone6, IPhone6 Plus, (iPhone4 etc. cannot be upgraded iOS8)
ipad series: IPad2, IPad3, iPad4, ipad Air, ipad Mini, ipad Mini 2 (IPad1 cannot be upgraded iOS8)
ipod series: ipod Touch 5 (TOUCH4 etc cannot be upgraded iOS8)

Here are some of the more distinctive features and new applications we picked up from iOS 8:

Continuity
Every year, Apple is trying to tie the mobile operating system closer to the desktop operating system. With the new continuity in iOS 8, you can finally get exactly what you haven't done on another iOS device, like writing half the emails or reading half the pages. As long as your Mac or ipad is using the same WiFi network as the iphone, you can answer the phone directly from your Mac or ipad.
But if you don't have WiFi available, you can also have the ipad or Mac use the iphone's personal hotspot to connect to the Internet. Guided by the idea of seamless interconnection, Apple has also made a number of upgrades to iOS 8, including its End-to-end file sharing protocol AirDrop support for file sharing between Mac and iOS devices. As a result, continuity may be the most noticeable feature in iOS 8.
Health
This new fitness application can test your fitness and sleep habits. As Apple publishes the HealthKit developer tool, Third-party applications and hardware will be able to sync with the health platform so that it can learn more about your health and fitness and can provide more accurate data to your doctor, such as resting heart rate, cholesterol and blood sugar levels.
It will track and export most of these health statistics next year when Apple Watch is on the market. Health application marks the beginning of Apple's entry into the health sector, which will help us improve our health, and make it easier for doctors to assess and diagnose the user's biometric data.
Keyboard
For a long time, iphone and ipad users can only use one keyboard, the one that Apple provides. But while Apple has improved its iOS 8 keyboard and added intelligent predictive functionality, it has finally opened its keyboard application interface to Third-party developers, and Swype and Fleksy have released their own keyboard apps. It is believed that iphone and ipad users will soon be able to see a lot of interesting keyboard applications.
Message Application
Previously, imessage only supported text messages. But in the iOS 8 system, this free messaging service will add more functionality, including recording and sending voice and video information, and users do not have to jump to audio or video applications at all. You can also share your location information in the IMessage application, rename the group chat group, and tag the chat to find it. More importantly, you can now "leave" those group chats without having to remove the path from the phone.
Photo
Now, you can incorporate your photos into your albums, or browse through your photo gallery in chronological order. In iOS 8, Apple has finally added an important search function to the photos application, and you can find a photo based on the time, location, or album of the photo taken. This feature also has the ability to search historical records. You can also save your favorite photos in a separate album and edit the photos directly in the photos application. Finally, the IOS 8 system also adds a new camera mode that supports time-lapse photography (time-lapse video).
Icloud
It's not really a cloud like Dropbox or Google Drive, but the platform has improved significantly in the iOS 8 system. Handoff and continuity solve most of the sync errors that occurred in previous releases, and the additional photo library application in the new version can help you keep your photos in icloud so that you can download them to iOS devices anytime. icloud will also allow you to open documents in any format from iOS devices or Mac computers, which is clearly conducive to productivity gains.
Family sharing
icloud can only distinguish between different iOS devices, not the people who use them. But in the iOS 8 system, there is a new feature called "Family sharing" that supports up to 6 family members sharing the same iOS device, but their accounts are separate and can share a variety of content such as e-books, movies, TV dramas and apps. You can also make a dedicated home calendar and photo album, so all the accounts on all the devices can easily share photos and content in one place.
Extension pieces
This is an important addition to the entire iOS system. Previously, iOS applications relied on sandbox, where applications were separate and other applications could not access their data. But in the iOS 8 system, extensions allow different applications to securely communicate with each other and insert user interfaces into each other's applications, so that Third-party developers can determine how their content is displayed and shared in other applications.
It also means that applications like Pinterest can add shared tools, or cloud vendors like box or OneDrive can add document-sharing tools. This will allow applications to become more interactive, while ensuring their security.
Control
Currently, the Notification Center (Notification Center) in iOS and OS X includes default applications such as calendars (calendar), Stocks (Stocks), and hints (reminders). But in iOS 8, applications can also use extensions to provide unique notification center controls, and users can see which apps they download have those controls.
For example, if you already have a SportsCenter application, you can see a SportsCenter control in your mind in the notification. You download it, rearrange it, and you can see the latest match scores and news in the Notification center. It can also be used for interactive applications like ebay. Users do not have to open the ebay application, they can use the control of ebay directly bid for goods.
Siri
If there's one thing Google Now does right, it's that you can use your personal assistant without your hands. You just say "OK, Google," and Google Now will start. In iOS 8, Apple has learned this, as long as you say "Hey Siri," Siri will start.
    It also adds new features, including the ability to rearrange songs through Shazam and buy itunes content directly. Apple says Siri has also made some important upgrades, including speech recognition and 22 of new sounds. (Lin Jingdong)