Ok I found, PR = Pull Requests, I’m a real beginner under Github 
It is possible that I missed something, but normally I added everything that was necessary.
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Hi,
I tested dev 4.4.0 with the modifications for the Runcam 2 4k and it works perfectly.
It is necessary to increase the CAM_RC_MDE_DELAY at 2000 for don’t have a problem with the toggle between the video mode and OSD.
Next step, I would like to implement the picture mode, it is not the same job.