Building with iOS 6 support

We have build our iOS app update with SDK 3.4.0 (Xcode 6), so the minimal supported iOS version is 7.1 (according to the Titanium Compatibility Matrix). However in the App Store it is stated that the minimal requirement is iOS 6.0. We get complaints from iOS6 users that the app doesn't work anymore after the update. Shouldn't be the minimal ios version be set to 7.1 during the build process? (I know this can be forced manually in tiapp.xml by setting <min-ios-ver>7.1</min-ios-ver> , but that is too late now).

How can we prepare a version of the app that run's on iOS 6? Users cannot return to the previous version of the app since they updated already.

Building the same code with SDK 3.3.0 / Xcode 6 can be build to simulator and seems to work fine, but I don't have access to an older device to test with. Preparing an Ad Hoc build to send to test users, results in an error:

[INFO] :   Invoking xcodebuild
[ERROR] :  ** BUILD FAILED **
[ERROR] :  The following build commands failed:
[ERROR] :   Ld build/Release-iphoneos/Daisylezer.app/Daisylezer normal armv7
[ERROR] :  (1 failure)

Thanks, Edmar.