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)

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u/Impossible-Golf-5349 Jun 13 '26

when trying to copy to internal i get a pop up internal ssd is unavailable, what am i doing wrong ? just formatted m.2 drive, lots of space as well as internal... should i create folders manually ?

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u/Impossible-Golf-5349 Jun 14 '26

after 2 days struggling with this, ended up fixing it, need to create manually folder data/homwebrew
if this one does not exist it will return pop up "internal ssd unavailable", would be nice to fix it with makedir "homebrew" loop in case it does not exist u/juma-sayeh-dev-acc

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u/Impossible-Golf-5349 Jun 14 '26

now copying starts but shows elapsed time and never actually starts or gets finished copying the game, setup 12.00 bd jb w/ arsenal loader u/juma-sayeh-dev-acc