As in, you can now craft your own "update" and sign the bootloader/entire package and it will flash?

edit:

> You still won't get a jailbroken PlayStation 5 with this leak, but it will make it easier for hackers to compromise the console's bootloader.

nope?

> Now that the ROM keys have been leaked (and assuming they are valid), a hacker could then decrypt and study the official bootloader and potentially use that as a starting point to understand how the PS5’s boot system works.

This would just allow further study.