supported4 is a new application available in Cydia that allows you to use the video output with cables that are not original from Apple, and forget about the error: «This accessory is not designed to work with the iPhone.
It only works with video, it is not to allow you to see your iPhone screen on television, but to see videos on it.
You can buy it for $4,99 en Cydia.
The application has a 10-day trial before buying so you can see if it convinces you or not.
You need to have done the jailbreak.
