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I have dell e6420 cant remember my bios password can anyone help I've tried everything. Service tag is 9sr76r1-1d3b

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Try these:

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The above solution does not work on an E6400. Any fix regarding removal of battery, shorting pins together, etc does not work. However, what does work is to use the Dell Asset/Service Tag BIOS Reset Tool that is available on Torrent Sites. Boot the CD image and when you are asked if you want to delete/change the service tag select "Y". When asked for the new service tag number re-enter your current service tag. Then the tools erases the BIOS and inputs the new service tag. A by-product of this process is that the BIOS master password is removed from the BIOS.

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