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Sony introduced a new mechanism.
Originally Posted by jarmster
Every file in the system update also has a .spkg_hdr.1 file associated with it.
You can repackage 3.56 and it will install without this because 3.55 doesn't know about them yet. BUT once 3.56 is installed the new mechanism requires those files to be present for every firmware package. And these have not yet been cracked.
So it is perfectly possible at this stage to make a 3.56 custom PUP (not one that does anything useful as it hasn't yet been cracked), but from then on you can't do anything else without cracking these. And you can't downgrade because the level 2 diag downgrader has been revoked.
So even if we knew how firmware 3.55 and earlier validated updates as being the same or higher level (we don't, AFAICT) and could work around that, we don't know how to create these new header files to get the 3.56 updater code to accept our new packages.
You need it if you have friends, so in your case you don't need it.
Originally Posted by flammingcowz
Thanks ratanddragon, that is exactly the answer i was looking for.
Sony may have won this 3.56 battle - but trust me they haven't won the war by a long shot. If anything they are sinking their own battleships.
If you are impatient you will need to pickup a new unit with firmware below 3.55, or wait it out for a new MFW/downgrading development to contend with 3.56. Alternatively you could learn code and with a NAND/NOR programmer downgrade your hardware manually.
I truly think that it is impossible for sony to fix themselves from this mess unless they somehow censor the whole internet. for every 1 developer who speaks out publically with their knowledge and developments, theres another 10 in someones basement replicating and advancing that work.
Newer hardware will not be easily done, but with so many millions of units available now I don't think it'll be a problem. If anything you will see a modchip be released or something for newer hardware to 'downgrade'