Using XCode 9.2 with iOS 11.3 or downgrade to iOS 11.2

Question

MrDos OP

Created Apr ’18

Replies 2

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Hi all,

I am developping an app with Unity and Vuforia.

There's a bug going on right now with Vuforia that prevents you from using XCode 9.4 beta with iOS 11.3.

So I need to stick to XCode 9.2, the download of which I was able to find in the developer resources.

However, my development iPhone 6s+ is running iOS 11.3, so I can't install the app with XCode 9.2 (getting the error "could not locate device support file").

I've found only one workaround but it is really painful.

If I archive the app, export it for internal testing, I can then add the .ipa to my iPhone from the latest XCode 9.4 (by click "+" from the Devices & Simulators window).

Any idea how to make that viable?

I tried to downgrade my iPhone to 11.2 but there doesn't seem to be any official way of doing that.

Thank you very much

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Answer 1

NotMyName OP

Apr ’18

Occasionally you can cludge your way through this sort of situation by installing multiple versions of Xcode on your computer, and if you get the order right the older version of Xcode will get the device support files from the new version of Xcode. All of the previous Xcode versions are available from developer.apple.com/downloads.

Otherwise, you're pretty much stuck. You're not allowed to downgrade from a release version of iOS to a previous release version.

That "internal testing" work around that you describe is actually the nicer, more convenient iteration of the what developers used to have to do in this situation for ad hoc distribution based testing. :-/

Edit: But isn't 11.3 still beta? If it is, I thought Apple had finally caved and put out instructions for how to revert from a beta iOS version back to latest release. I think it involves a device reset/wipe and restore, but you get back to using release versions of Xcode and iOS.

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Answer 2

MrDos OP

Apr ’18

Hi, thanks for your reply!

You say "if you get the order right the older version of Xcode will get the device support files from the new version of Xcode".

I do have multiple versions of Xcode and I would very much like to get the devices support files for iOS 11.3 on my Xcode 9.2.

Do you have more details about what the this order is or a trick to add support files to a version of Xcode?

Many thanks

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