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I have dell optiplex 755. I am unable to upgrade BIOS, BIOS is needs to be unlocked so I can upgrate BIOS to the latest. Please help.

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Hi Martha,

If you need to unlock/reset bios password, here's what to do:

Unplug the pc and remove the cover. Look at the manboard (the big circuit board inside). look for a round silver button cell battery, about 1.5 centimeters wide. Remove the battery from it's socket and leave it out for 1 hour. Then put the battery back in the same way it came out. Plug in the pc and turn the power on. The bios is now cleared, and you can update it if you like. If this is not what you wanted, or you need more help, reply to me and I can help more.

Hope this helps!



Posted on Jan 03, 2011

  • abbas
    abbas Nov 03, 2013

    Well same problem i m facing ....i've tried almost everything..dos bootable USB, replaced cmos battery , clear and reset bios but still unable to update bios system gives message like "bios update failed, unable to locate firmware in system memory"

  • abbas
    abbas Nov 03, 2013

    it all started 1 week before, everything was working fine suddenely system stop working and was giving display only CPU was turining on with diagnostic lights 3,4 on , i remove the memory and move to different slot then system start giving display but still when i switch the main power on system automatically starts without pressing power button on CPU with 3,4 lights on then i've to power off the system by pressing it's button for few seconds after that i again press power button system starts and works fine...don't know wat's happening..


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