i'll try and make it More Understandable
PSP hacking 101
Frist to understand PSP hacking you must understand that you can't hack it unless you have a PSP frimware version 1.50 or 1.00 but everyone uses 1.50.
A modchip makes it so that you can put a Custom frimware without haveing to have a v1.50.
OK now that we understand what we Need Here is What you can Do
Frist if you have psp version 2.00-3.03 you can downgrade the PSP to a 1.50
-2.00 Does Not need GTA UMD (Unpatched)
-2.71 Does Not Need GTA UMD (Unpatched)
-3.03 DOES Need GTA UMD (Unpatched)
Get the Easy Downgraders here (Full)
http://psp.xtrusion.es/content/descargas.htmOr
http://www.psp-hacks.com/category/35(For 2.00 to 1.00 and Back to 1.50 go here
http://www.mphweb.com/index.php?file=14 )
I think the 2.80 DownGrader Does Not Need a GTA UMD But i Have Not Tested it
there is a 2.50/2.60 downgrader But you need GTA UMD and seeing that theres a 2.71 downgrader that does not need the GTA UMD then there really is no Need for the 2.50/2.60 downgrader.
Ok now the FUN part the TA-079 and TA-086
http://www.modchip.com/installpics/psp-up/TA-08220check.jpgif you have a TA-079 or TA-086 i know you can downgrade from 2.80 to 2.71 But i am not Sure if you can go anylower then that (i don't Know)
I think with a TA-079 or TA-086 your more or Less "s**t Out OF Luck" (for Now)
(Do Not Try and Use a Downgrader on the TA-079 or TA-086 Unless it tells you that you Can)
Doning So WILL Brick our PSP
Well i hope this has Helped you in Understanding What you'll Need to Hack your PSP.