There are a number of gaming forums with full instructions, and help from other members.
http://www.noobz.eu/joomla/ - home of Noobz, the PSP's most clueless development team, originally Ditlew and Fanjita but now a loose collection of like-minded PSP developers. This site is dedicated to homebrew on the PSP (Sony PlayStation Portable).
http://forums.noobz.eu/index
http://forums.maxconsole.net
http://pspupdates.qj.net
U NEED TO HACK YOUR PSP WHICH IS REAL HARD
Cause you need to make you PSP Go To the lowest firmware (kinda like downgrade) Then you can install you custom firmware
No You Cant!
Yes. However if you have a more recent firmware such as 6.20 or 6.10 you cant. It only works with psp 1000 and 2000
Put it into recovery mode and then re-install the firmware.
Get a pandoras battery and magic memory card...
No, you have to downgrade first.
you cant
The ZSR4154WE is not currently supported by any Linux-based firmware.
If you have a message up in the networking box that says firmware missing, you can probably download them and install them in a tarball. That's what I did with the Broadcom STA drivers.
You're in luck! There seems to be a homebrew enabler out for official firmware 5.03. http://www.youtube.com/watch?v=lPMiNTbL7YQ
It means the jailbreak program did not download properly ... you have to install the privies version and re-download the program ...
Firmware updates are specific to certain models of Macs. It's possible that the firmware you're trying to install is not the correct firmware for your particular Mac. If the firmware was downloaded by going to  -> Software Updates (or just by running Software Update), then the firmware is likely the correct version, and may just be corrupt. If the firmware was downloaded from Apple's Support Downloads, then it is most likely the incorrect firmware for your Mac.