Ps4 update via usb stick?

My Ps4 needs to be updated, as my Wi-Fi in my room is so bad I have to do it via usb. But somehow my Ps4 recognizes my update did not follow all the steps that were on the Internet but it doesn't work, I'm slowly getting my nerves at the end and really don't know what to do now I've been trying for 5 hours How do I have to do this on the USB to make it work?

p.s has to do the update 8.03

If your wlan is Schlevht then go to the router or buy a long lan cable for such occasions