Reset Dell System Disable Service tag password.

How to reset or unlock Dell with System Disable - Service tag?

Reset or unlock System Disable Bios Password on Dell: Inspiron 3043, Inspiron 3138, Inspiron 3147, Inspiron 3148, Inspiron 3521, Inspiron 3531, Inspiron 3537, Inspiron 3721, Inspiron 3737, Inspiron 15 5565, Inspiron 15R 5520, Inspiron 15R 5521, Inspiron 15R 5537, Inspiron 15R SE 7520, Inspiron 17R 5737, Inspiron 17R 5721, Inspiron M531R 5535, Inspiron M731R 5735, Inspiron 5542, Inspiron 5545, Inspiron 5547, Inspiron 5548, Inspiron 5551, Inspiron 5447, Inspiron 7348, Inspiron 7347, Inspiron 7352, Inspiron 7558, XPS 12 9Q23, XPS 15 L521X, XPS 14Z L412Z, XPS 14 L421X, Alienware M11x R2, Alienware 14, Alienware M11x, Alienware M14x, Alienware M14x R2, Alienware M14x, Alienware M18x R2, Alienware 18, Alienware M17x R3, Alienware M17x R4, Alienware 17, Vostro 560, Vostro 3531, Vostro 7347, Vostro 15 3537, Vostro 15 3531, Vostro 3721, vostro 2521, Vostro 15 3521, Latitude 3540, Studio: Studio XPS 1647, OptiPlex: Optiplex GX1, Not all models are listed.

How To Apply the Dell System Disable password, and unlock Bios?

You can Reset the Dell Bios password within bios setup
Restart your Dell pressing F2 Every second,
Type the provided Dell system disable password we sent you,
Go to: security,
Then: passwords,
Look for the option: Unlock Setup,
Go to: administrator password Them Reset the password
There will be 3 fields
Type the System Disable password we sent you in the first field
And leave the other 2 fields Blank !
Click on Save it.
Password should now be removed and the laptop will stop asking for the current password on boot.