This is the only known way to roll back firmware, and it involves physical modification of the console's motherboard. ConsoleMods Wiki How it Works : The PS4 stores the current firmware and the immediately preceding
The PS4 system software version numbers (e.g., 9.00, 13.02) indicate: A) Hardware revision B) Firmware/software release level C) Region lock codes D) Controller model compatibility ps4 downgrade 1302 to 900
This could indicate a failing hard drive or corrupted Syscon. Try a new hard drive first. If the errors persist, your console may require professional hardware repair (reballing or Syscon replacement). A "downgrade" will not fix hardware failure. This is the only known way to roll
If you genuinely have a console stating firmware "1302" (or similar obscure numbers): ps4 downgrade 1302 to 900