On a retail PS4 (non-debug, non-jailbroken), a direct software-only downgrade from a higher firmware to 9.00 or lower is impossible . Sony uses one-way fuses (e-fuses) inside the Syscon chip. Once your console updates past version 9.00, the fuses blow permanently, preventing the bootloader from accepting older firmware.
The keyword is a cry for help from PS4 users stuck in an update loop (error 1302) who want to reach the promised land of jailbreakable firmware 9.00 (“900 top”). However, the technical reality is harsh:
As of now, the PS4 scene has advanced, but limitations remain:
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