1: bootloader
2: boot_app0
3: partitions
4: firmware

After flashing - reboot the board and wait for around 30 seconds for the partitions to be created. Once partitions are created PS4-Hack should show up in your wifi, connect to this access point (no password is needed). You can then open your web browser and go to http://1.2.3.4/admin.html to change some settings or upload files to the spiffs partition such as PS-Phive files.