PSP homebrew developer Jas0nuk has released version 2.7a of the PRXDecrypter app. Included in version 2.7a are some more stability and updates from the previous release (updated with the new keys). A quote from Jas0nuk is listed below and provides the changelog for PRXDecrypter version 2.7a as well as a developer statement.
"I just updated the PRXDecrypter 2.6b, with new keys for 6.xx and added some features like extracting hidden prx for firmwares 6.xx
Changelog 2.7a
- Now you can decrypt 6.3X and up EBOOT.BIN
- You can extract hidden modules from any DATA.PSP including 6.xx
- decrypt/decompress 6.XX modules.
- Keys for 6.XX – 6.60 added.
- Log file can be enabled or disabled on app startup (with LTRIGGER)
- Small fixes and other changes."
Source