Remove Activation Lock on the device Follow the onscreen steps to enter the Apple ID and password you used to set up your device or your device passcode. On the initial screen when it displays Dell logo, quickly press 'F12' button before it So, if you dont remember the password, it would be useful to see the manual. If you believe you know your Master Password, but it isn’t accepted, try these steps: Make sure you’re typing lowercase and uppercase letters correctly. (Available on systems produced on or after 2011) A user must be physically present at the system to use the recovery password. this is the only thing you can do to remove the password on a dell laptop because the bios password is on a separate chip set and is not controlled by the CMOS battery. A hard drive doesn't have a password to use it to my knowledge, it is probaly a CMOS password that keeps you form starting up, but to cure that you can either a. 
While power on the tablet, press and hold the volume down button (second silver button from the top on the left side) until the Dell logo appears.
Perfectly works on all brands of PC & laptop such as Dell, ASUS, Sony, IBM, Lenovo, HP, Acer, etc.
If you have created a password reset disk from your Dell Inspiron laptop before, you can use it to unlock your Dell laptop password easily.
The Tunesbro Password Recovery tool will appear on your screen and all you have to do is select the Windows version you're using and select the locked user profile. After this is done, select "Just remove my files". I've tried Dell - who nicely spent about 20 minutes trying their generated master password, but it didn't work.
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