Originally Posted by pspv1.00

Time For A Game!:
You need some way of launching the application for it to work and flash the psp.
On 2.50/6 there was an exploit made by Edison Cater that allowed you to load files threw GTA, Fanjita made an Eloader to load more files etc...
Thats how the downgrader file works on 2.5/6..
You cannot just load a file, Unless you have a Sony encryption key.
With 2.7+ they patched up GTA.
So any files that can flash you psp to 1.50 wont load and therefore wont flash.
Hope this helps...

Thanks
PSPv1.00