80020148 is the firmware error code. Try running the latest update, as some games won't let you play them unless you are running the most recent update.
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error 80551001 in PlayStation Store
Bring your PSP to a game store (like Gamestop) and ask them to fix it.
DNS error 80410413 means the web address was typed in wrong eg: i tryed every thing when this mesg came up, then when i nearly gave up i typed www.facebook.co.uk and it changes the address to http://en-gb.facebook.com/ the psp cant do this so it just gives an error mesg i then typed in the address on my psp the exact address; http://en-gb.facebook.com/ AND IT WORKS :) WOWO :)
delete the data and puted in your psp
my psp could not internet play