The message appeared on a dusty console modding forum in the small hours of the night: “PS4 Tool Downgrade v1.00 NEW – No PU, No BSD, 100% working.”

• Official PS4 firmware file for the target version (named PS4UPDATE.PUP) — use only legally obtained files.
• v100 downgrade tool package (instructions, executables or payloads). Follow the tool’s directory structure if specified, e.g., /PS4/UPDATE/ or tool-specific folders.
• Any auxiliary payloads / exploit files required by the tool (often a .BIN or .PKG).

Conclusion

He picked his donor: a launch PS4 with a dead Blu-ray drive but firmware 1.00 still on its NAND (he’d never updated it). He dumped the NOR with a clip. Then he took his 5.05 console—the one he actually wanted to downgrade—and followed the steps.

Downgrading to 1.00 is not necessary – it can’t play any modern games or even most disc games.

The release of the PS4 Tool Downgrade v1.00 opens up new possibilities for console enthusiasts. Some potential implications and uses of this tool include:

Note: Downgrade may wipe internal storage; verify backups before continuing.

Changes: