Well, I don't think you can now, the iOS 5 is out for iPod Touch. To get that, plug your iPod into your computer. Click on iTunes if it isn't already up. When iTunes pops up, a box should also pop up*. It should say something about a new software update. Click "Download". Just wait for it to install and, Wa-la! Your software is updated.
*This will only pop up if you haven't hit somehing about not showing the software update thing before. (It's a box that you have to check)
Only certain model iPod touches are capable of supporting iOS 4.3. The minimum iPod touch capable of supporting iOS 4.3 is an iPod touch 3rd generation, from 2009. The highest iOS that this model iPod touch supports is iOS 5.1.1.
iOS 4.2.1 is the highest iOS firmware you can reach on the iPod Touch 2nd Generation.
No, only iPod Touch 5 can use iOs 7
You can't downgrade an IOS on your iPod Touch.
iOS is not compatible with any iPod that is not an iPod touch. This means there is no way to install it on an iPod shuffle, classic, or nano.
iOS 7 isn't available on 4th gen iPod Touch
You can't downgrade IOS!
iOS 5 is only available to iPod Touch 3rd Generation and Above. If you are eligible, plug in your iPod into iTunes and it should prompt you to upgrade to iOS 5.
no but you can get it on a iPod 5
Sadly, no. The latest version of iOS for the 4th Generation iPod Touch is iOS 6.1.5.
no only on the ipod touch 5th gen
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.