It is a security setting the psp version 1.5 doesn't accept (WPA). Version 2.0 and above accept this seting and are able to use it. To make this work you will have to tell yur dad to change the router so it used WEP, not WPA.

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ok bro thnx my dad only knows how to press a button so just tell me this wep is only a setting right in routers config not dsl box?

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Yes, the security settings are in the router configuration.

If you don't know how to access the settings, you'll need to look up the Default Gateway on a computer, usually 192.168.1.1

im having trouble i change it to WEP but when i do and put the password i want for some reason i wont get internet access untilll i disable it help plz

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Are you entering the correct WEP key? When you are connecting to the router, you must enter the key defined within the router's settings. When you are selecting WEP in the settings, there will be text boxes which say something like "Key" or "Password". That's where you enter the ten-digit code. Or you can usually enter a set of numbers, and it will generate a WEP for you.

yeah it shows up but not even on my computer will it work the internet this sucks

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Hm...I'm not sure what the problem is.
Sorry, but I'm out of ideas. I guess you'll need to update or use DevHook, where more security is supported.