Hardware & Devices

Hello, I need help of friends or community experts with this problem:

We have about 100 PCs of the same brand and model manufactured in 2010. I need to change in all these PCs, periodically and manually, the system and user passwords through the BIOS and would like to automate this procedure through a software and had the following idea:

The motherboard manufacturer sent me a program to read and write the CMOS. I starts with the setting up these passwords on a single PC, saving all your content to a file and after with this program, I write de CMOS to the others machines. Detail: this program is to be used with a boot disk with DOS.

As I would like to carry this procedure through the central server, copying the file with new CMOS data to a specific folder existent on all machines. In each PC there is a process running on Windows XP SP3 that as soon as received the file, make the reading the contents, writing the new passwords in its CMOS, deletes the file from the folder and restarts yourself. The theory should work, but not, inclusive on the same machine where I created the file. What happens is that every time I update the CMOS, the changed settings are retained, but the passwords always come back clean, i.e. without any protection to access to BIOS.

Now I'm basing my work on one program called CmosPwd which can be found on the site www.cgsecurity.org, but no options works properly on the motherboard that we have. Our platform apparently uses the Award BIOS 6.00 PG as base to these chinese mother boards. Tried new contact with the manufacturer, but they do not provide a map of the structure of the CMOS. I discovered that, comparing the various files, passwords are not written in ASCII mode only 5 bytes at offset 0x40, that I believe to be your CRC, as showed below:

    CMOS DUMPS WITH PASSWORDS:

    SYSTEM: 11111111
    USER  : 22222222

    CMOS Bank 0:
        00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
        -----------------------------------------------
     0: 59 00 55 00 14 00 05 02 05 13 26 02 40 80 08 00
     1: 40 f0 00 00 02 80 02 00 04 14 00 00 00 00 00 00
     2: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fc
     3: 00 04 20 80 00 00 00 00 00 00 00 00 00 00 00 00
     4: 59 00 55 00 14 00 05 02 05 13 26 02 40 80 08 00
     5: 40 f0 00 00 02 80 02 00 04 14 00 00 00 00 00 00
     6: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fc
     7: 00 04 20 80 00 00 00 00 00 00 00 00 00 00 00 00

    CMOS Bank 1:
        00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
        -----------------------------------------------
     0: 59 00 55 00 14 00 05 02 05 13 26 02 40 80 08 00
     1: 40 f0 00 00 02 80 02 00 04 14 00 00 00 00 00 00
     2: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fc
     3: 00 04 20 80 00 00 00 00 00 00 00 00 00 00 00 00
     4: 59 00 55 00 14 00 05 02 05 13 26 02 40 80 08 00
     5: 40 f0 00 00 02 80 02 00 04 14 00 00 00 00 00 00
     6: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fc
     7: 00 04 20 80 00 00 00 00 00 00 00 00 00 00 00 00



    SYSTEM: AAAAAAAA
    USER  : BBBBBBBB


     CMOS Bank 0:
        00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
        -----------------------------------------------
     0: 51 00 01 00 15 00 05 02 05 13 26 02 00 80 08 00
     1: 40 f0 00 00 02 80 02 00 04 14 00 00 00 00 00 00
     2: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fc
     3: 00 04 20 80 00 00 00 00 00 00 00 00 00 00 00 00
     4: 51 00 01 00 15 00 05 02 05 13 26 02 40 80 08 00
     5: 40 f0 00 00 02 80 02 00 04 14 00 00 00 00 00 00
     6: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fc
     7: 00 04 20 80 00 00 00 00 00 00 00 00 00 00 00 00

    CMOS Bank 1:
        00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
        -----------------------------------------------
     0: 51 00 01 00 15 00 05 02 05 13 26 02 40 80 08 00
     1: 40 f0 00 00 02 80 02 00 04 14 00 00 00 00 00 00
     2: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fc
     3: 00 04 20 80 00 00 00 00 00 00 00 00 00 00 00 00
     4: 51 00 01 00 15 00 05 02 05 13 26 02 40 80 08 00
     5: 40 f0 00 00 02 80 02 00 04 14 00 00 00 00 00 00
     6: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 fc
     7: 00 04 20 80 00 00 00 00 00 00 00 00 00 00 00 00




Has anyone had a problem like this and got a simple and cheap solution, or would have any hint to solution this? I appreciate some kind of help.

Thanks so much,

Edison Fernando.
Brazil.