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August 20, 2011 // 12:17 pm - Following up on the initial PS3 Slim 3.70 Downgrade and PS3 3.7x Downgrade for Slims and Fats with NOR Flash news, this weekend Italian PlayStation 3 hackers DiGiTaLAnGeL (linked above) have made available a guide to fast swap PS3 Slim CFW 3.55 to OFW 3.70 with 2 HDDs and ProgSkeet followed by a New Method - PS3 Downgrade v2 Supports all NOR Flash from TwoStone.

To quote, roughly translated: Today I'll write a tutorial to "fast-swap" between CFW 3.55 and OFW 3.70, using 2 HDDs... at the end of the tutorial, you'll be able to swap between the firmware just flashing a dump on your PS3 using Progskeet. (instead of downgrading and losing all data).

The first steps are not so easy, so take your time and go on, by the way, you must have some skill with Progskeet, and it must be 100% working on your console.

What we need:

We need 2 HDD because the NOR flashes stores some parts of the current FW on the HDD so we will need 2 HDDs, one is for 3.55, and one is for 3.70.. We will call those HDD "A" (for 3.70) and "B" (for 3.55) don't mix them up!

Starting with a PS3 Slim with OFW 3.70.

1. Plug in HDD "B", format and prepare it if it's required by the PS3 and you should have your 3.70 up and running.
2. DUMP your actual NOR and call it "original dump 3.70.bin"
3. Now flash your "downgrade.bin" (edited with the personal data found in "original dump 3.70.bin")
4. Turn on your PS3 and be sure that the PS3 is asking you to press the PS button (downgrade.bin flashed correctly )
5. Insert a 3.55 Downgrade dongle and enter factory/service mode.
6. Copy Lv2Diag.self by Jaicrab and the 3.55 NO CHECK UPDATE renamed as "PS3UPDAT.PUP" in the root of your USB Stick.
7. Plug in the USB Stick in the most-right USB port of your PS3 and wait for it to turn OFF.
8. Leave the factory mode using the other Lv2Diag.self
9. After the reboot, you need to configure and set up your system... now you have a fully working 3.55 CFW based on KMEAW "NO CHECK".
10. DUMP your actual NOR and call it "swap dump 3.55.bin"
11. Unplug HDD B and Plug in HDD A.
12. Turn on your PS3, plug in your USB Stick containing official 3.70 update and press start+select when asked.
13. When the PS3 reboots, check that the system is fully working and DUMP your actual NOR and call it "swap dump 3.70.bin".

NOW IT'S OVER! You should have "swap dump 3.55.bin" and "swap dump 3.70.bin" ... Now you just have to swap HDD and flash the corresponding dump:

  • HDD A = swap dump 3.70.bin
  • HDD B = swap dump 3.55.bin

WARNING: Do not install other CFW than the "NO CHECK" one... because it's used to make the "fast-swap" working... if you flash something different you will not be able to go between the 2 FWs. This CFW disable the Syscon checking at the startup... so it will not freeze or complain when the syscon says "3.70″ and your FW is 3.55

In case you wanna update your console with a future "3.80″ or-so firmware. Do not update your console when you are running 3.55 firmware! You have to go to "swap dump 3.70.bin" and then update as usual (XMB or recovery)... By the way, the downgrade is confirmed working only on 3.70... we haven't tested it on other FWs, you could lose the possibility to go back to 3.55!

Guide: PS3 Slim CFW 3.55 to OFW 3.70 with 2 HDDs Fast Swap

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#67 - elser1 - August 29, 2011 // 7:47 am
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you sound like you have the knowledge to do what you say.. well done mick!!

#66 - HeyManHRU - August 29, 2011 // 6:11 am
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Quote Originally Posted by michael040990 View Post
i wish i could afford one of these chips i'm thinking about putting all the information i read about in this fourm and others in one organized website dedicated to downgrading and mods i need help extracting all the pertinent information though.

Another good idea I'm just waiting for a simple and easy downgrade/dual booting method.

#65 - michael040990 - August 28, 2011 // 12:15 pm
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and i wanted to be original darn lol great minds think alike also if you didn't want to go through all the trouble of the dual nand you could always hock your infectus up permanently to your ps3 and then make a new mini usb port on the back of your ps3 buy cutting and wiring up a male usb to female mini usb then use a usb to mini to cook it to your computer when you need to flash.

i wish i could afford one of these chips i'm thinking about putting all the information i read about in this fourm and others in one organized website dedicated to downgrading and mods i need help extracting all the pertinent information though.

#64 - HeyManHRU - August 28, 2011 // 3:24 am
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Something like what you just said was supposedly accomplished, look here -

... and look on page 6 in the same thread I linked you to.

#63 - michael040990 - August 28, 2011 // 3:05 am
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when all is done im going to make a chip switch i'll buy a identical nand set and put 3.70 on the original and 3.55 on the copy soldered to a daughter board also a hard drive cable split when you flick the switch it changes from one harddrive plus nand to the other harddrive and nand no need to reflash every time. how does that sound.

#62 - marmar - August 27, 2011 // 8:04 pm
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I think imma do it too

#61 - Marsupilami - August 27, 2011 // 6:30 pm
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I've got a PS3 with CFW3.55, can I install CFW3.55 no check and then swap the HDD and install OFW3.70?

I don't have Progskeet and I don't want to have it btw...

#60 - michael040990 - August 26, 2011 // 6:49 pm
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ok first off i would like to say hello this is my first post here at ps3news and i am excited to be involved in any projects. that being said, would it work if you take the same model ps3's one with firmware 3.7 and the other at 3.55 and dump the 3.55 nand firmware and write it to the 3.7 nand chip using something like INFECTUS or progskeet will that downgrade from 3.7 to 3.55? or is there more details about it i need to know/edit?

#59 - trykenter - August 24, 2011 // 8:59 am
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I think my PS3 is old enough to try to crack open.


#58 - mushy409 - August 23, 2011 // 6:17 am
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Think you're confusing this method with the 3.70 NOR downgrade method - as I stated earlier, this method work ONLY with the 256Mb NAND consoles CECHA up to CECHG (phattys)

The other guide doesn't involve the Infectus as it doesn't support NOR flash. You'll need to be looking into buying a progskeet...