Instructions
Turn on your Sony PSP and wait for the PSP to boot into its main menu.
Navigate through the PSP main menu and select the "System Update" option from the far left of the menu. Select "Update Via Internet" and press the "X" button until the PSP is updated.
Press the "X" button to reboot the PSP and you will be brought back to the PSP main menu. The Adobe flash plugin will have been updated.