In light of the recent Illuminati Exploit and 3.50 downgrader, Sony have released a patch in the form of Firmware 3.51 for the PSP. The patch removes the exploit from the System Software preventing the execution of homebrew as well as downgrading to firmware 1.50. The Japanese PlayStation website has already been updated with the update, but the US and European websites are yet to be updated.
Changelog (tanslated from Japanese Website):
Security:
- A patch has been added that addresses a security vulnerability in the system software.
Internet:
- You can now connect to Remote Play via the Internet
- [Communication Settings] has been added to the Remote Play Menu
- [The RSS Channel Guide] has been added to the RSS Channel
[Via: PlayStation Japan]