).
He's just posted a very handy little utility on his Twitter.
NetConfig Manager lets you save your network configuration, restore a network configuration, duplicate it on another Psp and delete all configurations present on your Psp.
Usage
Copy the Netcnf folder to the PSP/GAME folderLaunch Netconfig Manager from the XMB like a game.
The backup will be named netconf.bak
To restore, just use that same file. Image unavailable (removed by its host) Download NetConfig Manager
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Source
thanks
Everything for PSP