I have a 64x64 RGB Panel from Joy-IT and is flickering

Here the back from the panel

Datasheet

and the Manuel

I have a extension board from joy-it

What I’m doing wrong?

You didn’t say even a word about what are you doing with it?
Please describe your project. What about the connection?
Could you show your code?

I test only the examples of the api…

sudo examples-api-use/demo -D 0 --led-rows=64 --led-
cols=64

sudo examples-api-use/demo -D 0 --led-rows=64 --led-
cols64 --led-slowdown-gpio=2

and the text scroller

sudo ./text-scroller -f ../fonts/9x18.bdf --led-rows=64 --led-cols=64 blah

can you show a video of the flicker?
does your board/setup work with another panel?
what Pi are you using (hopefully not a pi0v1 or p1 or pi2)
did you follow the directions in the README to turns off sound and other stuff that can cause flickering?

should be blah with a raspberry pi 4b not used with a other panel

sudo ./text-scroller -f ../fonts/9x18.bdf --led-rows=64 --led-cols=64 blah