How to Revert the PS4 to a Previous Firmware (Full Tutorial)
If you download a "firmware downgrade file" onto a USB drive and attempt to install it through Safe Mode, the Syscon chip instantly detects that the update file (9.00) is older than the current system version (10.50) and blocks the installation. ps4 downgrade 10.50 to 9.00
The only legitimate way a PS4 can be rolled back to a previous firmware version is through a complex physical process known as . How Slot Switching Works How to Revert the PS4 to a Previous