You cannot. The iOS 5 update is only for Iphone 4, iPod touch 4, iPad 1, iPad 2
iOS 4 is the name of the iPad operating system (iOS) and the version (4)
Yes, when iOS 6 comes out it will be free of charge, just like iOS 5 and iOS 4 were.
You can update it to iOS 5 the same way you update it to any other iOS version. The 4th generation (and indeed the 3rd generation) iPod Touch can be updated to iOS 5.
iOS 5 will be compatible with iPhone 3GS as well as iPhone 4.
Ios 7 is the latest ios. Ios 7 is available on the fifth generation iPods, recent iPads and iPhones 4 and 5.
You have to update your iPad 2 to iOS 5 if you bought it prior to the launch of iOS 5. You can update now to iOS 6 (and soon iOS 7), by plugging your iPad 2 into the computer you authorized with your iTunes account and waiting for the pop up that will ask if you want to install the new software update. The process should take 1-2 hours.
No, the update is only for iPhone 4, iPod touch 4, iPad 1, iPad 2. The highest version iOS Firmware for the iPod Touch 2G is 4.2.1.
If its iOS 4 to iOS 4.3.5 then go to JailbreakMe.com If it has iOS 5 to iOS 5.0.1 use Redsn0w (provided down below in related links)
Yes. iOS 6 will continues to support voice memos just like iOS 4, 5, and 7.
no but you can get it on a iPod 5
Since ios 7 is designed for the iphone 5, it will probably make the iphone 4 slower.