You can use https://kameleonreloaded.github.io/900/ to start the exploit, then send app-dumper.bin through netcat on port 9020. You should take 9.0 payload, you can get them from AlAzif twitter.
Everything to make fpkg is here https://github.com/CyB1K/PS4-Fake-PKG-Tools-3.87 explanations and...