PS4 Jailbreak Firmwares

You can backport games but you can’t roll back to the previous firmware version. If you are the above-listed firmware versions, Sell your PS4 system and buy the console with the listed firmware installed.

It’s all on you, if are you done installing backport of game, updates, and DLCs. You can jump to 9.00 or if it’s not a problem for you, stay on more stable 5.05 firmware version.

An exploit execution adds/unlocks new and useful features under debug setting for you such as package installer, FTP, and many others.

5.05 bit more stable than 9.00, but we can’t ignore other features. Check example below
Game Required Firmware – 9.00 | Your Firmware – 9.00, No Backup, Update, DLC backport require
If Game Required Firmware – 9.00 | Your Firmware – 7.55 or lower. You must install backport for your game, update, and DLC (if you have installed it).
Game Required Firmware – 7.55 or lower | Your Firmware – 9.00, No Backup, Update, DLC backport require