Xcode Cannot Run Using The Selected Device

Perhaps post in the Owners lounge forums so Andos and Francois can make sure there isn't any issues.

There is a problem with XCode 4.5 that actively denies to run the app if 'armv6' is listed in the devices it should compile for - we are working on that.

Currently you can try go to the XCode project properties and replace the contents of the 'Architectures' entry and the 'Valid architectures' entry to $(ARCHS_STANDARD_32_BIT) instead.
XCode will then itself figure out which architectures to use and it should work.

Please note that you can no longer compile for 2G devices with XCode 4.5 as Apple has removed support for them completely in their new development tools it seems.

Looks like my previous post was wrong. It was a weird issue with XCode not being able to change permissions on the app that was already installed on the device.
I fixed it by deleting the app from the device and then running it normally from XCode. Does that work for you?

I have similar problem. My iphone 3gs was today updated to ios 6.0 and xcode from 4.4 to 4.5. Now i cant run my app on any device iphone 3gs, ipod 4, ipad. Xcode still shows "Xcode cannot run the selected device". I had selected Architecture Armv 6,7 later only 7 and it doesynt work with both

Of course i tried delete app before compiling.

As I wrote over email: Try if the recent beta 3 release of the iOS exporter works.

Manual change to make it work: Remove 'armv6' from the 'Valid Architectures' property in the XCode build settings.