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On the Apple developer site, it states that "Devices updated to iOS 5 beta can not be restored to earlier versions of iOS." I believe this is new, and remember seeing that Apple is changing the way it provides older versions of iOS. I'd like to be able to install iOS 5, knowing that I can revert to iOS 4 if need be, since I have some apps that may not be compatible.
Does anyone know if this is possible? And if so, A) is it hard, and B), does it actually violate Apple's TOS?
Thanks!
Apple has repeatedly said that there is no officially supported way to downgrade from iOS beta OS versions. Don't play with beta OS versions except on test devices which you don't need for running apps that may not be compatible with the beta OS. e.g. you need a spare device to temporarily trash.
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I am beginner in iPhone.
I want to make the iPhone app that compatible for all iPhone versions like 3 and above.
Please help me What to set in the project to make it compatible to all version.
Thanks in advance.
You should set the deployment target in the target summary.
Edit: Xcode 4.5.x only supports iOS 4.3 and later so you can't support iOS versions below it.
Edit 2: If you are using and old version of Xcode this might be helpful for you. iOS 3.x support in Xcode 4
But you should think twice before writing an application that targets iOS4 and above.
Targeting to old versions of iOS means that you must not use any of the API's of the next iOS versions such as ARC and auto layout. As a result your code will be harder to maintain and some features would be impossible to implement.
Before going on with it, think about how many users will you satisfy by supporting iOS4. Read these thousand words from apple and then decide for yourself
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I'm looking at upgrading my development iPhone 3GS from iOS4.3.5 to iOS5. Now that Apple even rejects apps that use the older SDK and contain an iPhone 5 launch image, I see no need to keep my iPhone 3GS on iOS4.
Even though the latest s/w for iPhone 3GS is iOS6, will an upgrade to iOS5 be successful through the server verification. I ask because I tried to restore in a similar situation previously on a different device (and different iOS versions) but it wouldn't let me so I had to upgrade to the latest compatible version of iOS.
Success/failure stories would be much appreciated.
Thanks,
James
PS. this may not be a techy question, but as a community of developers, this seems to be the best place to ask!
Apple no longer signs iOS5 meaning that you can't restore to iOS5 unless you have previously saved the SHSH blobs either in Cydia or with a tool such as TinyUmbrella.
See Explained: SHSH Blobs
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I know that it is possible to install lower versions of IOS to jailbroken devices over various tools by creating custom firmware.The problem is we have some test devices in the company and we want to have one device eactly with IOS 4.3. It will not be downgrade since the device itself has IOs 4.2.1 installed.Is there a documented way to active it and the most importantly where can i find older IOS versions?
EDIT:
Editing because this no longer works and it gets downvoted by people who didn't read the comments.
Apple wants us to use the latest version, and develop for the latest version, there is no way of downgrading anymore.
OLD ANSWER:
You can download any firmware for any iOS device here
iOS Downloads
To install it, you have to go to iTunes and click on update with the alt key pressed, then you can choose the .ipsw file with the firmware you want.
For the "This device isn't elegible..." message try this
Apple doesn't want you to install anything but the latest version available of iOS, so every install of a firmware will get checked with Apple's servers.
There is a way to save the authorization for other firmwares with tools like TinyUmbrella, but you can only save the authorization of the currently allowed version; so, if you did not use TinyUmbrella 2 years ago when iOS 4 was the newest version, there is no way to downgrade your device.
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Right after I upload my binary over to Apple in iTunesConnect, it appears this message,
"The binary uploaded for the latest version of this app indicates that iOS 4.3 or later is required. Apps that require iOS 4.3 or later will not be available to Verizon iPhone users. If this app could be compatible with earlier iOS versions, you may want to reject the binary and upload a new one that indicates the earliest compatible iOS."
What to do so that I can have my app reach as many as customers possible?
Thank you.
Find those 4.3 exclusive methods and look for alternatives available for 4.0
In future projects, try to develop thinking on a reasonable iOS version.
Today to develop with a base of 4.0 it's more than reasonable.
To be honest, if you wait a week, the Verizon iPhone will be on iOS5 and you can use iOS4.3+ APIs.
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I'm trying to figure out if I can update my iPhone to iOS 5 now rather than wait all the way till fall, is there a way to do this?
Your iPhone must be linked to a Apple Developer account in order to update to iOS 5. Find someone who has an account and ask them or pay $99 for a developer account and an early upgrade.
To answer your question directly, you can't: you need iTunes 10.5, a mac only application for now.
iOS betas are released for developers to test their applications, not end user to test Apple's. Unlike many other betas, a bug reporter exists but isn't the main purpose of this.
Also, developers are clearly asked not to install the betas on their main devices (their personal iPhone for example). Not only could doing so result in a very buggy day to day experience, but Apple sometimes releases versions a few days after the previous version expired, literally blocking the device in the meantime (the Purple Screen of Death).
Sorry to announce you just lost a hundred bucks, unless you buy a mac and start programming (this is a nice opportunity isn't it?).
IOS 5 is still in beta and available only to Apple Developer program subscribers.