It is written in the first post:How to I update to 6.20? I'm kinda of a noob with the PSP.
If you are not already on Official Firmware 6.20...
- Download 6.20 official firmware (for PSP 100X/200X/300X) or (for PSP Go).
- Copy the UPDATE folder to /PSP/GAME/.
- Launch the 6.20 update on your PSP, and tell it to update.