Why is PS4 stuck in safe with one option

My brothers were playing on our ps4 and suddenly the screen turned black and it took us to safe mode but the 7th option was the one we could move to and the only selectable option,so me and my brothers went on youtube to see if there was anything there.We all found the same solution by going to the playstation site and doing the steps like downloading the correct file putting PS4 folder on a 1gb+ usb drive and then putting a UPDATE folder with the installation file in it(we formatted the usb before this stuff as well to FAT32 and a full format not quick ) after we plugged the usb drive into the ps4 and it allowed us to initialse and when we tried it would always reach to 99% and then showed the error (CE-33567-4) and we cant get out of safe mode no matter what we do please help!!