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I'm building a HTML iPhone 4 web app, and I need to convert to iOS5 because I know safari has fresh bugs which need fixing, but I need to be able to convert back tomorrow. Is this possible?

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migrated from Dec 6 '11 at 13:10

This question came from our site for computer enthusiasts and power users.

did you mean you need to convert to iOS4? – Graeme Hutchison Dec 6 '11 at 13:58
similar to… ? – Global nomad Dec 6 '11 at 15:37

Depends. If your device has never been jailbroken then no, you cannot downgrade your device.

If your device has been jailbroken, then yes, maybe. Though it is definitely some work to edit your host file so that itunes checks a different server to sign your stuff and allow you to install a certain iOS version on your device. You got to have already given them (those jailbreak servers) your device information, which is typically strongly adviced by Cydia as well as any jailbreak instruction.

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