Dell 8FC8 Bios Password Patcher

**Markus1741** · 11-06-2023, 03:02 AM

Re: Dell 8FC8 Bios Password Patcher

Originally posted by SMDFlea

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DISCLAIMER: badcaps.net and its members do no support unlocking stolen or company-owned devices.
The unlock scripts given here are for personal use only, ie. you accidentally set a password on
your own machine,you forgot the password you set a long time ago or you mistyped the password
when setting it and cannot get in again.

*************************************************************************************************
DISCLAIMER: THE SCRIPTS ARE FREE AND ARE INTENDED FOR EDUCATIONAL PURPOSES ONLY.
You CAN download it, use it.I only ask that you DON'T modify it ,sell it or try to make a profit
from it,and that you please credit the authors for the time and work they put into it.
I TAKE NO RESPONSIBILITY FOR ANY DAMAGE YOU DO TO YOUR MACHINE. Making these kinds of
modifications is risky and might leave you with an unusable/broken machine. The scripts are not
perfect by any means, and while I haven't bricked anyhardware (yet) I can't promise that won't
happen to you.

USE AT YOUR OWN RISK.

**************************************************************************************************

Its no secret that the 8FC8 bios backups can be patched,some of our members can unlock them easily with a hex editor.This has led to a big increase in the number of requests being made,so i have released this easy to use (semi)automatic patching method that automates the manual hex edits.
The software used is windows only.
One script has been left out,but will possibly be added to a 2nd release at some point,with an open source hex editor that will run on Mac,linux and windows.

The above disclaimer and the instructions are in the attached README.txt file inside each of the attachments.

Do NOT post any bios requests in this thread please,lets keep it clean.If it works for you a thank you message would be nice,or if you can afford a site donation that would also be appreciated.

Code:

[8FC8] 16,24,32MB Unlock.zip SHA256 Hash: c73470135cf6d055347464f9b7817f9501c4cbfa3dcc565c42db86756490362f

[8FC8] Precision 5570 64MB Unlock.zip SHA256 Hash: 02311017b8a0db761cef30006a7c1c27845f1757e6928003177a97992a261d6b

Hello SMDFlea, thank you very much for the script.
I had my difficulties at first but if you understand the logic behind it you will see that it works excellently.
He took the trouble to write a script that automates the process of unlocking 8FC8.
Thank you for that.
You should just make the effort and try it out.
If it doesn't work right away, just do it again…
You just have to learn how to use this great tool.
Read the README.txt thoroughly and it will work.
The Tiny Herxer also works under Ubuntu 20.04 under Wine, I tried it.

**volinakis** · 11-06-2023, 03:20 AM

Re: Dell 8FC8 Bios Password Patcher

Great job as usual, SDMDFlea!

**Maxpower3** · 11-06-2023, 03:24 AM

Re: Dell 8FC8 Bios Password Patcher

Well done good job, thanks very much
not all understood either but I'll look at it

**retrooo** · 11-06-2023, 08:50 PM

Re: Dell 8FC8 Bios Password Patcher

hi am using the script and so far i have no succeed,but ill keep triying today,the error at 5mps is normal or only the four steps are needed to work?=

Update, i have succeded to unlock 2 machines with 32mb main bios, the script works !!! Thanks so much
@smdflea master!

smdflea

**blackshift** · 11-07-2023, 05:28 PM

Re: Dell 8FC8 Bios Password Patcher

Hi, I'm new here and I looked through the script and I'm trying to understand how / why this works.

I see that the script takes the region from 0x1000 with a length of 0x100000, which when analyzed by the UEFITool is the padding after the Descriptor region.

Then you are searching for "00 FC AA" and replacing it with "00 FC 00"

The script does it again for "00 FD AA" and replacing it with "00 FD 00"

The rest just combines everything together.

My question is this:
Why does this work? is it setting some bitflag that the bios loads up and checks to see if its locked?

The region starts with P H C M, is this the code that runs and is that an opcode for a conditional branch or some other instruction?

Sorry if my questions are dumb.

**volinakis** · 11-08-2023, 05:45 AM

Re: Dell 8FC8 Bios Password Patcher

Originally posted by blackshift

Hi, I'm new here and I looked through the script and I'm trying to understand how / why this works.

I see that the script takes the region from 0x1000 with a length of 0x100000, which when analyzed by the UEFITool is the padding after the Descriptor region.

Then you are searching for "00 FC AA" and replacing it with "00 FC 00"

The script does it again for "00 FD AA" and replacing it with "00 FD 00"

The rest just combines everything together.

My question is this:
Why does this work? is it setting some bitflag that the bios loads up and checks to see if its locked?

The region starts with P H C M, is this the code that runs and is that an opcode for a conditional branch or some other instruction?

Sorry if my questions are dumb.

Code:

Why does this work?

because modification is putting bios in factory mode, used in factory assembly lines.

**SMDFlea** · 11-08-2023, 06:23 AM

Re: Dell 8FC8 Bios Password Patcher

Originally posted by retrooo

hi am using the script and so far i have no succeed,but ill keep triying today,the error at 5mps is normal or only the four steps are needed to work?=

Update, i have succeded to unlock 2 machines with 32mb main bios, the script works !!! Thanks so much
@smdflea master!

The error message is there because i removed one of the scripts but i forgot to edit the batch files

,so yes the error is normal

.The bat files can be edited to remove # 5 ,and the pause below it.

**poorrkkyy** · 11-10-2023, 01:36 PM

Re: Dell 8FC8 Bios Password Patcher

Thank you very much worked a treat

**ecdw94** · 11-11-2023, 01:52 PM

Re: Dell 8FC8 Bios Password Patcher

Does this work with Latitude 7420?
Edit: Or rather, I also have the 8FC8 suffix, I am not sure if this is a suffix for the bios version or what. But it seems like my question is answered if I understood that correctly. Please correct me if I am wrong.

**SMDFlea** · 11-12-2023, 05:21 AM

Re: Dell 8FC8 Bios Password Patcher

Originally posted by ecdw94

Does this work with Latitude 7420?

Yes it does.

**flores** · 11-12-2023, 12:28 PM

Re: Dell 8FC8 Bios Password Patcher

Hello. For dell latitude 5420 work? Thanks

**SMDFlea** · 11-14-2023, 03:18 AM

Re: Dell 8FC8 Bios Password Patcher

Originally posted by flores

Hello. For dell latitude 5420 work? Thanks

Possibly.Try it and let us know

**dopin13** · 11-15-2023, 04:47 PM

Re: Dell 8FC8 Bios Password Patcher

Thank you very much worked on Precision 3541!

**flores** · 11-16-2023, 01:53 PM

Re: Dell 8FC8 Bios Password Patcher

Originally posted by SMDFlea

Possibly.Try it and let us know

Thanks for answer. For now I don't have the interface to read XMC eprom. Only one CH341A. I'll buy RT809F next time.

**SMDFlea** · 11-17-2023, 05:11 AM

Re: Dell 8FC8 Bios Password Patcher

Originally posted by flores

Thanks for answer. For now I don't have the interface to read XMC eprom. Only one CH341A. I'll buy RT809F next time.

The CH341A can read some XMC chips if you use different software. Try NeoProgrammer .

**flores** · 11-19-2023, 11:35 AM

Re: Dell 8FC8 Bios Password Patcher

What kind of wson8 I need? 6x8 or 5x6? Thanks

**Phuoc Tan** · 11-19-2023, 09:04 PM

Re: Dell 8FC8 Bios Password Patcher

Thank you so much and I will try it

**xbcom** · 11-24-2023, 09:50 AM

Invalid File Specified

**logicboardre** · 11-24-2023, 12:06 PM

Is there an updated link to the patcher download?

Dell 8FC8 Bios Password Patcher

Dell 8FC8 Bios Password Patcher

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