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Help with downgrader for 2.71
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ice_wewe
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27. August 2006 @ 10:08 _ Link to this message    Send private message to this user   
Hello,

I'm not an experienced downgrader, nor do I pretend to be. I'm just a guy who's sick of sony, and wants to run homebrew. I've made a childish attempt, by manually editing the EBOOT.PBP for the 1.50 update, and changing all the 1.50 references to 2.80 references. Example:

----------------------

^@PBP^@^@^A^@(^@^@^@H^H^@^@E4^@^@E4^@^@E4^@^@E4^@^@E4^@^@ŵM^@^@PSF^A^A^@^@D^A^@^@?^A^@^@^S^@^@^@^@^@^D^D^D^@@
^@^@^D^@^@^@^@^@^@^@ ^@^D^B^C^@^@^@^D^@^@^@^D^@^@^@^R^@^D^B^K^@^@^@^P^@^@^@^H^@^@^@^Z^@^D^B^E^@^@^@^H^@^@^@^X^@^@^@'^@^D^D^D^@^@^@^D^@^@^@ ^@^@^@6^@^D^D^D^@^@^@^D^@^@^@$^@^@^@=^@^D^B^W^@^@^@~@^@^@^@(^@^@^@C^@^D^B#^@^@^@~@^@^@^@?^@^@^@K^@^D^B^Y^@^@^@~@^@^@^@(^A^@^@T^@^D^B^Y^@^@^@~@^@^@^@?^A^@^@]^@^D^B^^^@^@^@~@^@^@^@(^B^@^@e^@^D^B#^@^@^@~@^@^@^@?^B^@^@m^@^D^B ^@^@^@~@^@^@^@(^C^@^@u^@^D^B%^@^@^@~@^@^@^@?^C^@^@}^@^D^B^Z^@^@^@~@^@^@^@(^D^@^@~E^@^D^B^_^@^@^@~@^@^@^@?^D^@^@~M^@^D^B)^@^@^@~@^@^@^@(^E^@^@~U^@^D^B ^@^@^@~@^@^@^@?^E^@^@~]^@^D^B^E^@^@^@^H^@^@^@(^F^@^@BOOTABLE^@CATEGORY^@DISC_ID^@DISC_VERSION^@PARENTAL_LEVEL^@REGION^@TITLE^@TITLE_0^@TITLE_10^@TITLE_11^@TITLE_2^@TITLE_3^@TITLE_4^@TITLE_5^@TITLE_6^@TITLE_7^@TITLE_8^@TITLE_9^@UPDATER_VER^@^@^@^@^A^@^@^@MG^@^@MSTKUPDATE^@^@^@^@^@^@1.00^@^@^@^@^A^@^@^@^@~@^@^@PSP?~D? Update ver 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D? ?~B??~C~C?~C~W?~C~G?~C??~C~H ver 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D??~[??~V? ?~I~H?~\? 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D??~M~G级 ?~I~H?~\? 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Mise ?| jour PSP?~D? ver. 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Actualización de PSP?~D? ver. 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D?-Aktualisierung Ver. 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Aggiornamento della PSP?~D?
ver. 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D?-update versie 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Actualizaç?
ão PSP?~D? ver 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^^
@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@?~^бновление PSP?~D? ве?~@. ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D? ?~W~E?~M??~]??~J? ?~D?| ~D 2.80^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@2.80^@^@^@^@~IPNG^M
^Z

----------------

That is the header part of the file for Update 2.80, which tells the PSP what version it is. Example:

----------------

^@PBP^@^@^A^@(^@^@^@T^F^@^@Q2^@^@Q2^@^@Q2^@^@Q2^@^@Q2^@^@~A;9^@^@PSF^A^A^@^@^D^A^@^@~L^A^@^@^O^@^@^@^@^@^D^D^D^@^@^@^D^@^@^@^@^@^@^@ ^@^D^B^C^@^@^@^D^@^@^@^D^@^@^@^R^@^D^B^E^@^@^@^H^@^@^@^H^@^@^@^_^@^D^D^D^@^@^@^D^@^@^@^P^@^@^@.^@^D^D^D^@^@^@^D^@^@^@^T^@^@^@5^@^D^B^W^@^@^@~@^@^@^@^X^@^@^@;^@^D^B#^@^@^@~@^@^@^@~X^@^@^@C^@^D^B^^^@^@^@~@^@^@^@^X^A^@^@K^@^D^B#^@^@^@~@^@^@^@~X^A^@^@S^@^D^B ^@^@^@~@^@^@^@^X^B^@^@[^@^D^B%^@^@^@~@^@^@^@~X^B^@^@c^@^D^B^Z^@^@^@~@^@^@^@^X^C^@^@k^@^D^B^_^@^@^@~@^@^@^@~X^C^@^@s^@^D^B)^@^@^@~@^@^@^@^X^D^@^@{^@^D^B^E^@^@^@^H^@^@^@~X^D^@^@BOOTABLE^@CATEGORY^@DISC_VERSION^@PARENTAL_LEVEL^@REGION^@TITLE^@TITLE_0^@TITLE_2^@TITLE_3^@TITLE_4^@TITLE_5^@TITLE_6^@TITLE_7^@TITLE_8^@UPDATER_VER^@^@^A^@^@^@MG^@^@1.00^@^@^@^@^A^@^@^@^@~@^@^@PSP?~D? Update ver 1.50^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D? ?~B??~C~C?~C~W?~C~G?~C??~C~H ver 1.50^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Mise ?| jour PSP?~D? ver. 1.50^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Actualización de PSP?~D? ver. 1.50^@@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D?-Aktualisierung Ver. 1.50^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Aggiornamento della PSP?~D?
ver. 1.50^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@PSP?~D?-update versie 1.50^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Actualização PSP?~D? ver 1.50^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@??ение PSP?~D? ве?~@. ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@1.50^@^@^@^@~IPNG^M
^Z

--------------

This is an example of the header for the 1.50 update. So, by changing all the 1.50 references you see above, I tought I could trick the PSP into up-downgrading. So, if you're not lost yet, I put it on my PSP, and to my surprise, it started the update, but I didn't get very far. After that 'PSP' screen, it came back to me and said "The game could not be started. (80020148)". So, that means that somewhere else in the update, it is signed to prevent this sort of trick. I was wondering if anyone was willing to help me find that. Please remember, by offering your help, you neither agree to create a working downgrader, nor am I responsible for any damage to your and my PSP. I would assume that the only reason you're doing this is that you hate 2.71 as much as I, and wish to run homebrew. I admit, I'm about a newbish as possible when it comes to PSP software and hardware... I know the top of the ice berg, but that's it. If you want to help, that's great, I'd love to have it, if you don't, that's ok too, I can fully understand your wish to not brick your PSP.


Thanks,

Ice_Wewe

Stuck in 2.71 land.
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27. August 2006 @ 10:12 _ Link to this message    Send private message to this user   
wow..that's a whole chunck of codes~ @@







1.50 > 3.02oe-a > 3.03oe-b > 3.11oe-a > 3.40oe-a

Faq on PS1 to PSP game ripping: http://forums.afterdawn.com/thread_view.cfm/450045
Supastar
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27. August 2006 @ 10:26 _ Link to this message    Send private message to this user   
It won't work. Sorry.

Ridin' Dirty

10 Percent Luck 20 Percent Skill 15 Percent Concentrated Power Of Will 5 Percent Pleasure 50 Percent Pain A 100 Percent reason to remember the name

Money aint a problem
AfterDawn Addict
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27. August 2006 @ 10:28 _ Link to this message    Send private message to this user   
Sony created something called signed code. as soon as u change a single byte of the file it changes it to unsigned code so it wont run. This method has been thought up way back in the day of 2.0 days but ya like supastar said. wont run.
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AcidMagna
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27. August 2006 @ 10:41 _ Link to this message    Send private message to this user   
read into downgrading,and eboots before posting.
p.s at least you tryed
afterdawn.com > forums > consoles > sony psp - mod and firmware discussion > help with downgrader for 2.71
 

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