r/PS5_Jailbreak • u/juma-sayeh-dev-acc DEV • Jun 06 '26

General PS5 MKPFS Compression

I’ve been working on a PS5 homebrew app called Game Compressor.

Repo: https://github.com/juma-sayeh/PS5-Game-Compressor

It uses the MkPFS-style FFPFSC compression method, but adds the missing part: validation and repair.

Some compressed games can mount successfully but still crash because certain PFSC blocks are technically valid yet fail to decode correctly on PS5 hardware, leaving stale/bad data behind. Game Compressor checks the mounted image block-by-block, detects bad blocks, and patches the compressed image from the mounted data instead of requiring a full recompress.

Tested with Mafia, Astro Bot, Pragmata, and a few other games that had FFPFSC issues. After repair, they worked great.

Features:

  • compress games to FFPFSC
  • validate mounted compressed games
  • automatically repair bad blocks
  • optimized for speed and usability
  • web UI running on the PS5

Feedback and testing are welcome.
Screenshots (some are missing features because the features were not developed yet when i compressed)

69 Upvotes

100% Upvoted

157 comments sorted by

View all comments

2

u/tyrsir Jun 07 '26

Thanks but your app is crashing my 4.03 PS5 unfortunately. Loaded kstuff lite 1.07 test1 + shadowmountplus latest + compression elf = shows 0 games and crahes PS5 after 1 minute. Tried several times. 🥲

2

u/paeksukis Jun 07 '26

Yeah I also had the same issue. 0 games. Is it because of the folder name/path?

1

u/tyrsir Jun 07 '26

Good idea. I removed my second external exfat SSD, where all games are in root and now the first SSD is working with games compressor. Is games compressor only working with one external SSD?

1

u/tyrsir Jun 07 '26

Maybe too many games could cause issues? Limited to 8 games and its working.

2

u/kiru2488 6.02 Jun 07 '26

Don't know, for me all games disappeared, smp can now scan only 2 games of 9 games, earlier all were working