Instructions
Turn on your PSP.
Go to the Internet Browser's "Tools" menu. It is the second menu from the right.
Scroll down to "Delete Cookies" and select "Delete Cookies." Press "OK."
Go back to the Internet Browser's "Tools" menu. Scroll down to "Delete Cache." Select "Delete Cache" and then press "OK."
Go back to the Internet Browser's "Tools" menu. Scroll down to "Delete Browser History." Select "Delete Browser History" and then press "OK." Now your PSP's Internet Browser will have more memory.