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ZeBarack
Paper Tape
Posts: 1
Registered: ‎12-13-2014
Location: Russia
Views: 5,800
Message 11 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

 

I have successfully downgrade my system (Ideapad Z580) to 5FCN35WW as it was written above. But I lost my serial number and UUID on my laptop. That was real trouble for me!

Now I know how to prevent it.

To prevent this trouble DO NOT USE switch /force when you type command on the console! So command will be the following:

 

>winflash.exe /sv /sn /ipf bios ec /file 5FCN35WW.WPH

 

with this command your serial number and UUID will not be lost.

 

If you have already lost SN and UUID, you can fix them to do the following:

 

NOTE:  I am not responsible for any damage on your machine!!

 

1. Find correct information for SN and UUID (for example on the carton of your notebook);

2. Edit 5FCN35WW.WPH using WinHex editor.

 

    At offset 181280 HEX in the text area of editor replace 22000000000000000000000000000022 by your correct serial number. Add spaces after your SN to fill all 32 bytes. All 32 bytes must be filled.

 

   At offset 1812B0 HEX in the HEX area of editor replace 31 32 33 34 35 36 37 38 39 30 61 62 63 64 65 66 by your correct UUID. All 16 bytes must be filled.

 

3. Save edited file to 5FCN35WW1.WPH;

4. Download UEFI WInflash 1.4.83.0 flasher;

5. Now you have to hack environment.dll of 1.4.83.0 flasher (size 514 728 bytes). Open file environment.dll  in HEX editor (I used WinHex);

6. Replace


68 01 00 83 C4 0C 85 C0 74 15
by

68 01 00 83 C4 0C 85 C0 EB 15;

 

Save environment.dll.

 It will allow you to flash your modified WPH file with wrong checksum.

 

7. Rename environment.dll (size 545 120 bytes) in folder of 1.5.66.0 flasher (C:\Program Files (x86)\UEFI Winflash) to environment.dll.BAK, then place modified one in this folder;

8. Check twice, that you have done everything correct!!! Every modified file MUST be the same size, as it was before modification!!!

9.  Open the console. Navigate into the directory of UEFI Winflash:

 

>cd "C:\Program Files (x86)\UEFI Winflash"

 

And now execute the following command:

 

>winflash.exe /sv /sn /force bkfp bkoa3 /ipf bios ec /file 5FCN35WW1.WPH

 

10. Enjoy...

 

This procedure worked for me.

 

Don't forget to replace modified environment.dll (~503 kB size) by it's original version (~533 kB size), which was renamed to environment.dll.BAK.

 

 

SalzzZ
Blue Screen Again
Posts: 3
Registered: ‎12-10-2014
Location: Indonesia
Views: 5,752
Message 12 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

can I use the same 5FCN35WW.exe with z480?

mkamelx
Paper Tape
Posts: 1
Registered: ‎02-07-2015
Location: EG
Views: 5,570
Message 13 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

Thanks! worked on z580 win 8.1 x64
Uploaded needed files: https://drive.google.com/file/d/0B0WHa9HogN6lcW90b2ZjZGxxeWc
dvdh123
Paper Tape
Posts: 5
Registered: ‎07-28-2015
Location: Holland
Views: 4,892
Message 14 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW


@TuringMachine wrote:

Hi all,

 

since i had some trouble with the BIOS-Update myself and saw, that some people here have the same problem, i thought i share my solution with you.

 

Disclaimer: I am not responsible for any damage on your machine. When you manipulate the BIOS, things may go sour.

 

What you need:

- Phoenix UEFI Winflash 1.5.66

- An old BIOS-Update (5FCN35WW.exe)

 

Step 0: Connect Battery and Power Cord to your Laptop and close all applications you do not need.

 

Step 1: Install Phoenix UEFI Winflash 1.5.66:

Plain and simple. Follow the steps on screen. Program should be installed unter C:\ProgramFiles (x86)\UEFI Winflash. Remember this location.

 

Step 2: Get the WPH-File

Run the old BIOS-Update. The program will halt with some error, telling you something about secure capsules. Ignore it, but do not close the program. Navigate to C:\Users\Administrator\AppData\Local\Temp\ExtractTemp. Here you will find the file 5FCN35WW.WPH. Copy that file and paste it into the installation-directory of UEFI Winflash. Close the BIOS-Update.

 

Step 3:Get flashing:

Open a console (Windows-Key + R -> cmd). Navigate into the installation-directory of UEFI Winflash:

>cd "C:\Program Files (x86)\UEFI Winflash"

 

And now execute the following command:

>winflash.exe /sv /sn /force bkfp bkoa3 /ipf bios ec /file 5FCN35WW.WPH

 

Some dialogues may pop up, notifying you that some of the arguments are invalid. Just click "ok". The program should now start flashing your BIOS. This may take some time (up to 5 minutes). After this, the system should reboot and you are back on version 5FCN35WW.

 

I myself hav an IdeaPad Z580. Please let me know whether you were able to downgrade your BIOS with this method.

 

Happy Flashing and remember! remember! The fifht of November! =)

 


Hi,


I need help. I've followed your staps and I got stuck. When I want to Flash the back version I get this message "Invalid BIOS image!". What can I do to fix this?

dvdh123
Paper Tape
Posts: 5
Registered: ‎07-28-2015
Location: Holland
Views: 4,885
Message 15 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

Never mind I did something wrong.

"And now execute the following command:
>winflash.exe /sv /sn /force bkfp bkoa3 /ipf bios ec /file 5FCN35WW.WPH"

In cmd when you type in that command I did this:
winflash.exe/sv/sn/force bkfp bkoa3/ipf bios ec/file 5FCN35WW.WPH

Then I tried again, doing the exact the same command as you wrote with the space before the /.
It worked for me on Lenovo Z580!! Thank you very much!!!
najodleglejszy
Token Ring
Posts: 62
Registered: ‎07-04-2012
Location: Poland
Views: 4,878
Message 16 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

hi! I've just upgraded to Windows 10. would it be safe to downgrade to 5FCN35WW? I've got the file from the time when I was using Windows 7.

najodleglejszy
Token Ring
Posts: 62
Registered: ‎07-04-2012
Location: Poland
Views: 4,874
Message 17 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

OK, I've tried that, and I'm getting "Invalid BIOS image!" error.
dvdh123
Paper Tape
Posts: 5
Registered: ‎07-28-2015
Location: Holland
Views: 4,860
Message 18 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

Hi, that is the same error that I got.
After step 3, were you have to type in the command:
>winflash.exe /sv /sn /force bkfp bkoa3 /ipf bios ec /file 5FCN35WW.WPH
You must take it exact the same. That's the mistake that I've made the first time.
I hope it works for you!
najodleglejszy
Token Ring
Posts: 62
Registered: ‎07-04-2012
Location: Poland
Views: 4,848
Message 19 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

I was getting the error when following ZeBarack's instructions, but then tried those from the first post and it worked. thanks!

adel_novo
What's DOS?
Posts: 1
Registered: ‎01-24-2016
Location: France
Views: 4,068
Message 20 of 33

Re: Guide: BIOS-Downgrade from 5FCN95WW to 5FCN35WW

please in wich offset can i exactly find " 68 01 00 83 C4 0C 85 C0 74 15 " in the environnement.dll

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