The reason the "1302 UPD" method fails for 99% of users isn't because the file is fake—it's a real Sony update—but because the PS4 has a complex security chain.
Every PS4 console has a component called the Syscon (System Controller). The Syscon acts as the gatekeeper. It remembers the highest firmware version the console has ever successfully booted. Even if you swap the hard drive or try to trick the update process, the Syscon will check the version numbers. If the version you are trying to install is lower than what the Syscon remembers, the update process halts. ps4 downgrade 1302 upd
For the average user, software downgrading is impossible. The search for a "1302 UPD" file to downgrade via a USB stick is a wild goose chase. The reason the "1302 UPD" method fails for
We do not recommend this for 99% of users. One mistake and your PS4 becomes a plastic brick. We do not recommend this for 99% of users
If your goal is to run homebrew or revert from a problematic update, consider these realistic alternatives (none involve a magical downgrade):