Prerequisites
If you for some reason want to reinstall the OS manually on your iPhone it is possible. Perhaps you experienced issues with the copy of software that you upgraded to or perhaps you just need get an older version of the OS.
For those that do jailbreaking of an iPhone it requires certain versions of the iOS installed for example.
The important detail is that the software that you install manually has to be signed by Apple. The software is available to download on ipsw.me. There you will see if the software is signed or not. If the version you want is not signed it will not work, there are guides on how to bypass it out there, but I haven't tried them myself yet.
While downloading a copy of the iOS you also need iTunes installed on your computer.
Manually installing iOS
To install the iOS manually you simply connect your phone, put it in recovery mode (each model has a combination of the buttons that you have to press in order to enter "DFU mode"). You will now have the option of "restore" your iPhone.
Make sure to shift click the restore button in order to manually choose the software that you want to write to the iPhone.
It will then extract and install the software.
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