The button configuration is the same, simultaneously hold L+R+Left+Square for a couple seconds and then press and hold Start while in Settings>System Settings>System Information.
What it does is it brings up info from version.txt in flash0:/vsh/etc on the PSP, other PlayStation consoles may bring up more info.
Are there other hidden features? Find out. Give it a try and see for yourself and if you found one,kindly submit it in this thread
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