As already mentioned, and I'll stress it: you DON'T need to move to FASTBOOT section of the bootloader. The auto-update is done on HBOOT section.
Format your SD card while it's connected to PC with card reader.
Put the file on SD card - it should be the only existing file. Name it correctly. If you don't have extensions showing in your OS - name it PD15IMG and not PD15IMG.ZIP. If you don't know - try once with and once without the .ZIP in the name.
Put the card in your phone.
Boot with VolDown+Power.
It should ask you for update.
If it doesn't - it means you can't follow the guides because you keep misunderstanding something, so give the phone back to your friend and advise him to take it to someone who can.
Format your SD card while it's connected to PC with card reader.
Put the file on SD card - it should be the only existing file. Name it correctly. If you don't have extensions showing in your OS - name it PD15IMG and not PD15IMG.ZIP. If you don't know - try once with and once without the .ZIP in the name.
Put the card in your phone.
Boot with VolDown+Power.
It should ask you for update.
If it doesn't - it means you can't follow the guides because you keep misunderstanding something, so give the phone back to your friend and advise him to take it to someone who can.