I'm gonna help you here instead of PM incase anybody else needs a little help
Ok Nick lets get you started
1st you need to run pspgrader.exe on your computer (make sure the 5.00 ebootpbp is in the same folder you run it from Just the eboot which must be renamed from 500EBOOT.PBP TO EBOOT.PBP not in any folders). Next you need to attach the psp to your computer with usb cable.
pspgrader will find your psp, next click on create pandora stick. It will take a short while to complete, once it has finished close down pspgrader.exe and make sure the psp is connected to the computer. Next go into the folder I uploaded for you and click on the pandora folder until you see the upi4c folder, now drag and drop the upi4c folder to the PSP/GAME folder on the psp memory stick. Now unplug the usb cable and go to game column on xmb and down to memory stick and scroll down to ultra pandora installer v.4.c and click on it click on battery options and then click make battery pandora, once completed remove the battery and hold down the left trigger button and reinsert battery whilst holding down the left trigger and the psp will boot to a menu. Now click the top option of install 5.00 m33. Once it completes plug the psp back into your computer and go to the files i uploaded for you click on the folder PSP until you reach update, then drag and drop the update folder into PSP/GAME folder of the psp memory stick, once it is copied (it won't take long at all) unplug the usb cable and scroll to game column on xmb and down to 5.50 GEN D-3 (you should see a picture of a lady bird) press x and it will boot to a screen with some writing and 2 options on the right hand side click on enter and click on the top option flash install cfw5.50 GEN-D3. once completed you are good to go.
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once you have finished go back into ultra pandora installer and down to battery options and make battery normal again.