Teljoy - This Sony PlayStation 4 bundle is everything a gamer would want! Get this hot deal today. Upgrade, downgrade or cancel at any time: https://goo.gl/RozvEr | Facebook
How to: Downgrade digital PS4 games to version 1.0 *updated* - GamePitt -
BwE PS4 Syscon Guide (Paid SCE Flasher Version)
PS4 Syscon keys allegedly disclosed, could ultimately mean PS4 downgrade is possible - Wololo.net
PS4 News - UPDATE on Downgrading systems, someone has successfully done it - YouTube
How to: Downgrade digital PS4 games to version 1.0 *updated* - GamePitt -
How to downgrade PS4 from 10.71 to 9.00 |Reverting PS4 to 9.00 - YouTube
How to Downgrade PS4 from 11.02 to 9.00 Tutorial - YouTube
PKGDT: PS4 PKG Downgrade Tools GUI for Backporting Games by Gerfra | PSXHAX - PSXHACKS
PlayStation 4 Glitch Pinout, PS4 Slim / Pro Downgrading Update | PSXHAX - PSXHACKS