If you genuinely have a console stating firmware "1302" (or similar obscure numbers):
There is exactly one way to downgrade a PS4, but it is not feasible for the average user. ps4 downgrade 1302 to 900
Skilled hardware engineers can use a SPI Flasher (like a Teensy++ or a specialized programmer) to physically dump the BIOS/NOR flash chip from the motherboard. By hex-editing this dump, they can theoretically change the reported firmware version. If you genuinely have a console stating firmware
This involves physically modifying the console's motherboard to force it to accept an older firmware file. This is not a software hack; it requires soldering skills. How it works:
Risk Level: Extreme. One wrong move can permanently brick your console. This is generally reserved for advanced repair technicians.