Upgrade to 3.03-OE.C (Whatever)

ME again.

Good news, well sort of. I got my PSP replaced, but I had to buy the 259.99 one, which was an extra $58.00's and a nasty TA-082 model.

Fortunately, I got it downgraded to 1.50 and got 2.71 Devhook too, but now im hearing how much the CUstom Firmware is better and all, so im thinking it's time to upgrade.

Problem is I got Devhook, and I don't know how to delete it and then get to the Custom Firmware. Any help would be much appreaciated. Do I just do it manually or is there an installer? Help please