How to Hack/Install Custom Firmware on Sony PSP-E1004 Street

On seeing that a 12 year old kid was still alive in me, one of my closest friends decided to gift me a Sony PSP this birthday. As soon as I opened the box and played games for few minutes, I was more curious about things I can do on it than just playing games all day (that was the tech blogger in me speaking). But when I searched the internet everything demanded a custom firmware running on