This step requires precise timing.
Download your chosen firmware file (e.g., 9.00). Rename the file exactly to PS4UPDATE.PUP and place it inside the UPDATE folder. ps4 8.52 jailbreak
Move the PS4UPDATE.PUP file into the UPDATE folder. This step requires precise timing
A pop-up prompt will appear reading: "Insert USB drive now. Do not close this dialog until notification pops up." ps4 8.52 jailbreak