Sony on its official US Playstation blog announced that a new PSP system software update will launch soon. This new system software update for PSP will help users who need to change their PSN password, as they will be guided through the process.
The update will also stabilize some features of PSP. Check out below what Sony wrote on US PS Blog:
A new PSP system software update, v6.39, will be released soon. With this update, users who need to change their PlayStation Network password will be guided through the process. Also, system software stability during use of some features will be improved.