previous updates, today PlayStation 3 developer zecoxao made available a PS3VFlash Proof-Of-Concept (PoC) alongside a new PRX Loader for PS3IDA which he says should now handle almost all PRX files from 0.85.007 properly!
Download: ps3vflash_poc.7z (31.64 KB) / ps3vflash_poc.7z (new version, supports nand.bin) / PS3IDA GIT
To quote: ps3vflash_poc
New release (to help Joonie with his DECR issue )
This is a dev_flash from phat decryptor (algo was already on the original ps3hdd_poc but was never adapted to phatties, only to slims)
I've encountered a bug that resetted iv while the cycle was run for each sector (which made partial garbage in the initial sector area after the first sector) but that seems to be fixed.
The opposite is just as valid (meaning, if you want to encrypt, instead of decrypt, just change the order of operation in the code)