I've tried to install the app in my rc but it keep crashing, the rc its with the news firmware (wich only gave me conection issues with my P4 RTK )

Hello there Apolo Tec Aerea. I am sorry for the trouble this has caused and thank you for reaching out. May we please know what is the model of the mobile device that you rea using please? Kindly please try to uninstall and reinstall the DJI Go 4 application from this DJI Link ( https://www.dji.com/downloads/djiapp/dji-go-4 ) to see if the issue will still persist? In addition, kindly please sync all of your flight records before uninstalling the DJI Go 4 application on your mobile device for you not to loose your previous flight information. If the issue persist kindly please try using a different recommended mobile device for us to be able to isolate the said issue. Thank you.

DJI Go 4 does not support the P4R, even on the SDK remote.