Hi @STEF38440, let me see if I) can help out here.
I have translated your question to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
Could you possibly elaborate a bit on how you are trying to connect the phone to the projector? As it is not possible to connect the phone to a TV/projector using the USB-port, you will need to mirror mirror your screen to a Google Cast compliant device such as a Chromecast.
Please do elaborate as much as you can and I will do my best to assist you!
