In order for the PSP to read a 2GB+ memory stick, the firmware of the PSP must be 2.70 or higher. However, I would like to keep my PSP 1.5 due to an array of compatibilities with version 1.5. I know DevHook is a possibility, but I don't understand the logic in having a 4GB stick with version 1.5. If I have a 4GB stick with psp 1.5, will it show only 1gb w/o devhook, and when I want to play iso games and boot with devhook (firmware 2.70+) will it show the rest of the 4gb storage? Thanks.