1. DavidinCT

    OP DavidinCT Advanced Member
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    Hey all,

    Take this all with a grain of salt but, I figured the interest was here if people wanted to discuss it, or if they have not seen this before. People in the know say this is for real. It does not look like an EASY process.

    https://twitter.com/Centrinouk/status/1301628145523724288

    From the comments, I guess this is NOT on all PS4s that have been upgraded, you would need to have a back of your sflash and the syscon to be able to roll back.

    This was from the original poster on how he did this. "I used a teensy 4 for the glitching, teensy 2 for sflash and a renesas e2lite to flash a blank ic"

    This is a very little information on the actual process for this that I grabbed. Looking over things, in a nut shell, you make a backup, upgrade, then through a process you roll back after you re-flash chips.

    Anyone know the details of the process here ? I even found a PDF on how to do this... not for the faint of heart...attached !
     

    Attached Files:

    MaxToTheMax likes this.
  2. chrisrlink

    chrisrlink Intel Pentium III Hamster inside
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    wish it applied to me but my ps4 was upgraded before i got it ugh (this was also prior to the Flow's release and I was outside of that window of fw
     
  3. ForgotWhoIam

    ForgotWhoIam GBAtemp Advanced Fan
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    The problem is no ones going to have a backup because why would you have updated if you could be on 6.72 and lose your exploit. Almost everyone would have already updated before the exploit came out thus no backup.
     
  4. KiiWii

    KiiWii Reporter
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    It’s useful as a POC.

    We 5.05/6.72 console owners can dump sflash and SC, update to 7.55, buy games (play games), downgrade, dump games on 5.05/6.72.

    As I understand it: once a boot level exploit is found we can potentially downgrade any console using a donor SC dump (probably requires more files)
     
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  5. DavidinCT

    OP DavidinCT Advanced Member
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    I just found it very interesting and figure others would too. I am also still on 5.05, I did grab Last of US 2 and I was about to update to play this game.. but, I have been watching for this, as I really would not like to lose my mod.

    This looks like a pretty challenging mod though..
     
  6. chrisrlink

    chrisrlink Intel Pentium III Hamster inside
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    hmmm interesting theory kiiwii on the boot/donor aspect i wonder if one is known privately or if boot time encryption is that secure only time will tell but if it's reported to hacker1 i doubt even sony will let it see the light of day because of how much of a security threat it is
     
  7. KiiWii

    KiiWii Reporter
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    I couldn’t confirm, or deny :ph34r:
     
  8. MostlyUnharmful

    MostlyUnharmful GBAtemp Fan
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    You sure about the dumping part?

    Didn't a full revert require to backup the internal HDD (you know, portion of FW installed on HDD, etc. etc.)? Also lower FWs lack keys to dump recent titles, so I don't think that part is also feasible...
     
  9. KiiWii

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    Afaik, no. There are people doing this right now.

    I meant obtain 1.00 base games on PSN that are still on 6.72 firmware. Without updates.

    For example Beatsaber. Once bought and paid for on 7.55 PSN, revert back to 6.72, dump, profit.
     
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  10. godreborn

    godreborn Retired
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    there's several partitions on the ps4 hdd. there's either 14 or 15 off the top of my head. I recently formatted my ps4's hdd on my laptop using a sata station. I had to make the whole thing unallocated memory before putting it back in the ps4. anyway, one partition is where games is stored as mine was like 1.8GBs for that one partition.
     
  11. MostlyUnharmful

    MostlyUnharmful GBAtemp Fan
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    Thought the HDD was tied to the FW, but as @godreborn recalled, it's not a single partition.

    Ah yeah, like this is reasonable... ^__^
     
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  12. USUKDecks

    USUKDecks Member
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    A. it is real and it is NOT an easy process at all!!

    B. this does not allow to just grab a ps4 and downgrade firmware!!

    C. First you have to do ALL the steps involved to dump the CURRENT firmware you are on.
    IF done successfully, you can then update your system, at any point in the future you can go
    back down to the firmware you dumped... not an older one just that SPECIFIC one! and it MUST
    be from YOUR system and nobody else's.

    This is nothing even remotely close to like it was on the ps3. It will never be like that. And no, this will not
    get streamed lined to the point where you can do it all via usb. For those who want to be stupidly optimistic,
    go ahead, hold your breath....and wait. see what happens.
     
  13. KiiWii

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    @USUKDecks yeah we know.

    I also don’t have a flasher... yet... but the mini guide looks pretty straight forward.

    My testkit does update and downgrade but I don’t have any 7.50x firmware to get online with either :(
     
  14. jammybudga777

    jammybudga777 GBAtemp Addict
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    Could dual booting firmware become a thing for ps4? Pretty sure ps3 could
     
    Last edited by jammybudga777, Sep 8, 2020
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  15. USUKDecks

    USUKDecks Member
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    yeah ... I know you guys do ...but this was directed at the OP and those who seem to think its like (or gonna be like)
    ps3. ^_^;)
     
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  16. centrinouk

    centrinouk Newbie
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    hi, just chipping in to update on getting games grabbed from 7.55 (6.72 compatible ones)
    so far, no joy.
    rif manager does not like it according to my uart logs. despite having the rif and idx files pulled from the 7.55 hdd
    i have one more test to try then it looks to be a dead end unless one of the experienced devs can help

    in experience of the process, it is a bit nerve racking at 1st, but now i've had some practise I can swap fw in 30 mins or so
     
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  17. Urbanshadow

    Urbanshadow GBAtemp Maniac
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    I am actually curious about this too. I also would like to know if such thing as an emulated firmware could work.
     
  18. soumya260290

    soumya260290 Newbie
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    I want to downgrade from 7.55 to 6.72 is it possible now? their a post in this forum is it true?
    xhardhempus website
     
  19. KiiWii

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    Xhardhempus is FAKE. Do not use anything to do with them.

    There is a hardware method, but it requires you to have backed up files on the FW you want to get back to (6.72) before you updated to 7.55.
     
  20. deSSy2724

    deSSy2724 GBAtemp Fan
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    I have multiple low firmware PS4 consoles (all hackable). Can I back it all up, upgrade the firmware to the latest version, buy games from PSN, roll back to previous firmware, dump it all and made the games playable with lower firmware even if they were made for 7.00+ firmware then switch back to my latest firmware and continue using PSN without getting banned, sending a red flag etc?
     
    Last edited by deSSy2724, Sep 26, 2020
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