DELL D520 administration password

[craul4]

Hi I have an DELL D520 and I need the master passwd for BIOS ,or how can I disable the administration password at startup. is something like #HQKDP2j-595B .I read something about to replace the keyboard controller but I read that is necessary to read the BIOS flash (sst25vf080b) and to disable the BIOS password or to change it with another one that I know .I put the file in the archive and upload it here .

Thank you very much.