[PS5] Trophy registration failed on PS4 Games (0x80551618) from .ffpfsc

[SadykovIV]

Hello!

I created a utility for converting PS4 game .pkg images to .ffpfsc format. https://github.com/SadykovIV/PS4pkg_to_ffpfsc
The games mount and are playable. However, I get an error Trophy registration failed (0x80551618) when launching each game.

debug.log

[SadykovIV]

ShadowMountPlus mounts the image as a regular PFS file and creates a nullfs file in /system_ex/app.
However, it doesn't invoke the system LNC mechanism BeginAppMount → sandbox mount with appId/budget → EndAppMount, as is done during a standard PS4 installation from PKG game files via the Debug menu.

.ffpfsc image:
→ generic PFS/exFAT/UFS mount
→ direct nullfs to /system_ex/app/CUSAxxxxx
→ write to app.db
→ launchApp

launchApp (installed PKG)
→ BeginAppMount
→ appId + budget + NPDRM/PFS context
→ PrepareProcessLaunchDir
→ native sandbox/app0
→ spawnApp
→ game
→ system cleanup
→ EndAppMount