STM32F746G Discovery: What is the difference between CU3 and CU4 suffix?

[VSabn.1]

Hi,

I have a STM32F746G Discovery board on which I have developed an application. The application was running fine on STM32F746G Discovery CU3.

When I bought a new identical board and flashed the application, the display literally showed something  like this:

 My old board is DK32F746G$U3, which is working fine, but the new one is DK32F746G$CU4, which shows Black screen. 
I have no clue what the display is used for CU4 as I could not find any information about it. 

How do I solve this? 

[chiase]

I fixed it!

[waclawek.jan]

How?

[GaetanGodart]

Hello,

If you are using a new board revision with an old project, the simplest way to fix it is to create a new project and to import your GUI in the new project.
If your project is complex and uses code outside the scope of TouchGFX, either you manually add that extra "external" code or you apply the patch file (git apply patchname.patch) attached in this message.

Regards,