The latest Apple firmware, iOS 8 has been available since September 2014 and by now, most users are familiar with it. However, not every device supports iOS 8 so if you are looking to upgrade, the first thing you need to check is compatibility. Although there have been some performance issues and even controversy surrounding iOS 8, most bugs have been fixed and the most recent update of the firmware is iOS 8.1.2. To help you find out if your iPhone, iPad or iPod can use iOS 8, we have prepared a list of devices compatible with it.
iPhone :- 4s, 5, 5c, 5s and of course, iPhone 6 and 6 Plus
iPad :- 2, iPad 3, iPad 4th-gen and iPad Air
iPad :- mini and iPad mini 2 (retina display).
iPod :- Touch 5th-gen
Since iOS 8 offers many features that cannot be supported by older devices, it is no strange to see that iPhone 4 and iPod Touch 4th-gen are not in the list. Back when iOS 7 was released, iPhone 4 users experienced many issues so it’s probably a good thing that there is no option to upgrade to the new firmware. If you own an iPhone 4 or iPod Touch 4G, but want to get access to what iOS 8 offers, you will need to upgrade your device first.