This is actually quite simple.
1. Make sure that the new OS version is compatible with your iPhone/iPod Touch by reading the FAQs and other goodies on the apple dev sites.
2. Download the Beta if you have a developers account.
3. Extract it to a directory of your choice.
4. Open iTunes and plug your phone/ipod touch in to your usb port on your computer.
5. Make sure you back up your iPhone.
6. Hold down the ALT key on your keyboard and click restore in itunes.
7. A dialog pops up. Navigate to the directory where the new image that you wish to install is and select it.
8. Confirm that you want to update and away you go.
9. When update is complete do a restore from your last backup which will copy all your content back to your iPhone.
10. WARNING: The pre-release softwares are only meant for testing and development. So UPDATE AT YOUR OWN RISK.
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