Here's how to update your PS4 to 9.00 then Jailbreak, Much Better stability than 7.55, 7.02 or 6.72. : r/ps4homebrew
SALT on Twitter: "NIGHT KING SELFHOST v4.2 (Ps4 jailbreak 6.72 ) : - hen 2.1.3 + spoof to 9.99 fw - added hen 2.1.3b - delete all unofficial hen - Added payload