As mentioned
previously, following
Fail0verflow's Documentation, the
PS4 NoBD Updating Method, his
PS4 Updater Toolkit release and the
PS4 RL78 Syscon implementation PlayStation 4 scene developer
@theorywrong shared via
Twitter a new post on his blog at
TheoryWrong.me detailing his research with the PS4 Update Tool known as
OrbisSWU discussing PS4 NoBD, downgrading and how updates work.

Feel free to support his continued work on his
Patreon Page, and here's a rough translation via
Google of his
Latest Blog Article for those feeling a bit techy today:
OrbisSWU, the PS4 update tool.
Hello !
Here is finally the 1st article for the PS4 in relation to my work!
Note: Some points may be vague, it is not easy to understand a complex system like that, but I will try to transcribe the exact operation.
Today we are going to talk about the “OrbisSWU” tool which manages the PS4 update system.
Controlled PS4 update
OrbisSWU is a special application stored in all PUPs on the PS4. It allows updating the firmware of the PS4. Kernel, Application, Blueray Reader and WiFi / Bluetooth Chipset. Everything goes through him.
It all starts in the
SceShellUI, when your PS4 requests to do an update, it will start by recovering it in a specific folder. Luckily...