I am sorry if this is already posted and stuff but here is a tutorial on how to play homebrews that are for only version 1.00 psp for your 1.50 psp.
1.Download KXploit.
2.Download the homebrew/application.
3.Open Kxploit and then select the PBP file from the homebrew.
4.Change the psp unit to the removable disk i think.
5.Click Generate files and then put any extra folders in the generated files.
It might be kinda crappy but oh well. :D
