Upgrading to 3.50 (with the download)

Just a quick question.. perhaps I'm just being really blind today (er.. I blame the weather!)..

As my boyfriend needs to upgrade his PSP to 3.50, as he's on 3.40 at the moment.. I've downloaded the update and unzipped the folder. The file in the folder is eboot.pbp; so I copy that file (or is it the whole folder) to the UPDATE folder on his memory stick. Then I run the update.. as it says. Once that has finished, it says "Delete <pspdrive>:/PSP/GAME/UPDATE - This is the part I'm having trouble understanding. Any help would be appreciated.

Then its just buying him a 4GB stick and Lumines! *Sigh*

The information below is taken from the instructions that I downloaded, relating to the bit I'm stuck on.

3 - Unzip and place the file in <pspdrive>:/PSP/GAME/UPDATE

4 - On the PSP, run the 3.50 update from the memory stick under the Game menu.

5 - Delete <pspdrive>:/PSP/GAME/UPDATE

All that last bit means is just delete the folder UPDATE from your PSP memory stick when the update has finished

Ah okay thank you very much :)