I’ve bought a 9.00 PS4 off ebay (purposely on this version).
This allows me to use the webkit to kernel exploit chain to jailbreak my PS4 (as a semi-tethered jailbreak).
I’ve since started using the PPPoE version of the exploit (over the webkit) and use my LG TV as the connected Ethernet device (which runs the PPPoE server that sends the exploit).
I then run GoldHEN which allows me to execute game ‘backups’, mod said games, and also manage my saves (like back them up).
As a backup jailbreak method, I also have a burned BD disk with the BD-JB exploit