Item description:

PRXdecrypter can decrypt/decompress/extract:

firmware modules from official firmwares (up to 6.20)
updater modules from official updaters, including obfuscated ones
official updater DATA.PSP
reboot.bin and reboot_02g.bin from all retail firmwares
EBOOT.BIN and modules from all retail games (up to 6.20), and some nonretail/debug EBOOT.BIN files
M33 custom firmware modules
RLZ files
KL3E/KL4E files
meimg.img and me_sdimg.img
demos and game sharing DATA.PSP files (not all of the new ones)
index.dat
1SEG.PBP

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Changelog:

Decryption error for an old key, tag 0x4C940AF0, fixed.
Decryption key added for pops_04g.prx from 6.XX firmwares - tag 0x457B1EF0
Slightly more information when encryption is likely to fail (SHA-1 check warning)
NOTE: key for tag 0x2E5E10F0 does not appear to be working due to a new encryption method. I'll look into it.
New EBOOT.BIN key added for tag 0x2E5E12F0. As above, might not work.