Malaysia PS4 Jailbreakers - [PS4 payload FW 5.05] Here are some of the payload with its function available for 5.05 : 1. HEN - Enable Homebrew (fpkg,homebrew) - Enable 'Debug Settings' 2.
PS4 News - UPDATE on Downgrading systems, someone has successfully done it - YouTube
Downgrade PS4 7.55 Games to 5.05 | Backport Trick for PS4 OLD Firmware - YouTube
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
PKGDT: PS4 PKG Downgrade Tools GUI for Backporting Games by Gerfra | PSXHAX - PSXHACKS