iphone SDK: Universal binary app icon is blank for iPhone 3G

Question

I have a universal binary iPhone/iPad app. The app icon appears correctly when I install the app on an iPhone4 and an iPad. However, when installed on an iPhone 3G, the icon is blank (gray). I've tried everything I can think of that might fix this issue and would appreciate suggestions. I followed the Apple icon guidelines for universal apps found here: http://developer.apple.com/library/ios/#qa/qa2010/qa1686.html

1. I have a 57x57 icon named Icon.png for the iPhone 3G icon
2. In my plist, I have an entry for CFBundleIconFile with a value of "Icon.png". According to Apple this key should be included for backwards compatibility with iPhones running iOS older than v3.2.
3. In addition, I have a CFBundleIconFiles entry listing each of the various sized icons -- I included all the recommended icons given by Apple at the developer link above.
4. The icon on the iphone simulator, the iPad simulator, the iPhone 4 and the iPad look fine
5. I tried cleaning the project
6. I verified that Icon.png is being copied to the target
7. I verified that the Icon.png is in the app file.
8. I verified that the Icon.png is 57x57.
9. I've verified that the icon doesn't have an alpha channel. In fact, I tested with an icon from a previous app that did work and that still shows up blank on an iPhone 3G.
10. I tried saving the icon as an 8-bit and 24-bit png both with and without transparency.
11. Before rebuilding, I deleted the app and rebooted the iPhone.

Answer 1

Try all of the above and before building to your device, delete the app from the phone (optionally reboot) and ONLY THEN rebuild to the device.

Answer 2

Try CFBundleIconFiles (value type as an array)

as Icon.png, Icon~iPad.png, [email protected]

Answer 3

There may be two images with same name be present.please check it too.

All the best.