How to Uninstall IPHONE 5 software upgrade?

How to Uninstall IPHONE 5 software upgrade?

You mean iOS 7? It can't be downgraded, sorry.

It used to be possible, but once Apple stopped signing the earlier versions it was no longer possible. Basically, you're stuck with iOS 7 unless you want to go the unrecommended, warranty voiding, alternate method.
The original warning -
http://www.macworld.com/...l-can.html

The firmware download site w/signing status:
http://www.icj.me/ios/all#iPhone51

Its not that bad. But to answer your question, you can't sorry

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