iPad 1 orientation issue

iPad 1 orientation issue
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I’m testing my app in iPad 1 (first version of iPad).
I’ve coded like below:

  • (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
    return interfaceOrientation == UIInterfaceOrientationMaskPortrait;

Of course I also specified portrait only mode at Summary tab.
But cocos2dx shows me upside down reversed screen at iPad 1.
This problem is occurred at only iPad 1.
I’ve tested and got result like below:

iPhone 3GS is ok.
iPhone 5 is ok.
iPad mini is ok.
iPad 1 is ‘not’ ok.

How could I solve this problem?