Make sure the file is named correctly with a file manager or place the card in a reader and mount as a disk on your cpu - file MUST be named PG05IMG.zip - if you are using a pc sometimes the settings are set to hide file extensions - if this is the case your file is actually named PG05IMG.zip.zip and you will have to erase one of the .zips
File also has to be on the root (in the main directory - not inside any folder) of the sd card.
so you selected bootloader and in scanned for the PG05IMG.zip but it didnt find it.
when you are in hboot (white screen) does it say s-on or s-off at the top?