Xcode cannot run using the selected device when trying to build on my device SDK 4.3, iPhone 3G 4.2.1

I get this message and i do believe i know where the problem is.

I realized that i have IOS 4.2.1 on my iPhone (3G) and running SDK 4.3, i would guess this is the root to the problem.

As this开发者_运维百科 is an old iPhone it does not support 4.3.

Is there anything i can do if i want to test on this device?

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Set the iOS Deployment Target down to 4.2. You can find this in Project -> Edit Project Settings, Build tab, in the Deployment section.

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Try setting the Deployment Target in the Build Settings to 4.2.