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How to reset BIOS password

You'll have to ask Dell. We can't help you in here, because we have no way of knowing if you are the actual owner.
 
Solution
Usually pull out the CMOS battery. As you have that info have to contacted Dell for support ? They could have a tech come out and do that if it is under warranty as opening a laptop (for example) to get at the CMOS is a very risky that you will break something permanently.