Vpikhur tweets a downgrade is possible with only the currently public released keys

Discussion in 'PS4 - Hacking & Homebrew' started by tunip3, Aug 23, 2018.

  1. tunip3
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    tunip3 [debugger active]

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    Last edited by tunip3, Aug 23, 2018
  2. tunip3
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    tunip3 [debugger active]

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    @Cyan can the title be changed to Vpikhur tweets a downgrade is possible with only the currently public released keys

    I cleared it up and added the missing h

    — Posts automatically merged - Please don't double post! —

    Thanks @Cyan
     
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  3. antiNT

    antiNT a.k.a Johnny El Pollo Loco

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    Assuming there is a public method to downgrade, that method would require your console to be on 5.05 right ?
     
  4. isoisoiso

    isoisoiso GBAtemp Regular

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    Is he known in the scene? Any rep?
     
  5. mustafag32g

    mustafag32g GBAtemp Advanced Fan

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  6. dr_d00m

    dr_d00m Member

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    Oh yes, he is known in the scene and trustworthy ... he has done some hardware glitching, times ago on the ps4.

    I wonder how the downgrade will work, do we need a kernel exploit to downgrade? Is a dualboot possible with this?
     
    Last edited by dr_d00m, Aug 23, 2018
  7. KiiWii

    KiiWii GBAtemp Guru

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    They’re saying that you need to have backed up (something) on low fw prior to have something to downgrade to.

    Syscon stores historic data apparently.

    If your console has never been on 1.76 is can never go back to a fw it has never been on.

    ¯\_(ツ)_/¯
     
  8. mustafag32g

    mustafag32g GBAtemp Advanced Fan

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    well you can go back to 1.76 and then upgrade to another firmware?
     
  9. tunip3
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    tunip3 [debugger active]

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    Yes but that would mean if you had a launch console you can acsess almost every firm
     
  10. KiiWii

    KiiWii GBAtemp Guru

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    Yeah you could downgrade to the lowest fw you have ever been on, and upgrade to another fw you hadn’t: therefore adding it to syscon history.
     
  11. mustafag32g

    mustafag32g GBAtemp Advanced Fan

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    would it benefit people already on 5.05 with hen ? Can you like upgrade go online download necessary stuff and then downgrade again?
     
  12. tunip3
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    tunip3 [debugger active]

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    Suddenly 1.76 units are marked up again
     
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  13. dr_d00m

    dr_d00m Member

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    With special hardware you can use this maybe as dualboot ... I think you need something to write to syscon (kernel exploit or a hardware glitch/modchip). But I don't know if this is possible.
     
    Last edited by dr_d00m, Aug 23, 2018
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  14. KiiWii

    KiiWii GBAtemp Guru

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    Not without entry point on >5.05 (hardware or soft).
     
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  15. TheRealNGB

    TheRealNGB GBAtemp Regular

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    So what do you think the odds are that this could be used to downgrade 5.07 shipped units to 5.05 like the possibility that 5.07 units are just old 5.05 stock that has been upgraded?

    Probably not good right, but it'd be interesting to find out.
     
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  16. dr_d00m

    dr_d00m Member

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    This won't be possible ... if your ps4 was shipped with 5.07 then you can downgrade minimum to 5.07. So as I understand, with this method you will also need a previous dump of your 5.05 syscon files to go back to 5.05 again.
     
    Last edited by dr_d00m, Aug 23, 2018
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  17. chrisrlink

    chrisrlink Intel Pentium III Hamster inside

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    inside your crappy old PC
    I maybe wrong but I thought I read 5.05 with code modifications can be used on 5.07 it just hasn't been ported yet and it has been patched out on higher fw
     
  18. tunip3
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    tunip3 [debugger active]

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    For 5.07 no code modifications are needed but no update packages exist
     
  19. godreborn

    godreborn GBAtemp Guru

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    I think 5.07 was only shipped with a certain sku of Japanese model, so no update pup exists for that reason.
     
  20. chrisrlink

    chrisrlink Intel Pentium III Hamster inside

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    inside your crappy old PC
  21. KiiWii

    KiiWii GBAtemp Guru

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    I would like a minverchk equivalent for PS4.
     
  22. KiiWii
    This message by KiiWii has been removed from public view by Chary, Aug 23, 2018, Reason: Duplicate post.
    Aug 23, 2018
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