I used my windows phone based mobile phone in last six month. Now I installed Windows Phone 7.5 Mango onto it. After finishing this process I try to test the mobile phone. I get Application launch failed. Make sure that the device screen is unlocked and device is developer unlocked. I don’t understand why this message arrives onto mobile screen. After finishing such successful mango OS installation, normally application works correctly. But in my case, it gives problem. I think this update screwed up my developer unlock status? Any help regarding this issue must be appreciates.
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