Metal Gear Solid Peacewalker Demo 2: Not working on 5.50 Gen-D2

Online says it needs v6.00 to play it.
Whenever I want to play it, it says 'Game cannot be started'.I know there isn't any version.txt hacks for it, and I can't figure out to patch it.Anyone know how?
Thanks.

pspslimhacks says there is version.txt hacks for it:http://pspslimhacks.com/metal-gear-solid-peace-walker-demo-works-on-5-50-gen-b2/This is the version.txt you’ll need for it to run:

release:5.55:
build:3230,0,3,1,0:builder@vsh-build6
system:52556@release_555,0×05050510:
vsh6434@release_555,v52629@release_555,20090608:
target:1:WorldWide

I meant Peacewalker demo v2. It requires firmware 6.00. I can, however, use a PSP 3000 that my freind may let me borrow.