firmware ver. 3.90

I have firmware version 3.90 on my psp. I would like to play downloaded psp games on it. do i need to downgrade to version 1.50 or is there another way for me to do it?

You'll need to create a pandora battery or purchase a datel tool battery and the place some files on your memory stick that will rewrite your systems ipl (initial program load) to get you to 1.50 firmware. From there you'll want to update to custom firmware.

You can find tutorials for creating this stuff in our tutorial section.