Cytat: Dell uses in laptops are two types of lock is lock download and lock HDD drive.
For each type of lock provides the possibility of its withdrawal service method who is entering the master password.reboot.
Option # 1
1. Master password to unlock the download service is calculated from service tag
laptop (7 digits) and masks what is after the dash(data are grey
the password entry screen).
There are 8 types of masks - D35B, A95B, 595B, 2A7B, 1F5A, 1D3B, 3A5B, 1F66(CE), 6FF1 NEW!!! which service is determined by the algorithm for calculating the password.
After you enter master password profit from the combination of keys Ctrl+Enter and after the
entering a password on the BIOS and boot erased.
p.s
Remember this...master password, you only need to enter in the password window, which appears when the laptop is processed, but not in the BIOS as in the BIOS this password is usually broken!!!
If you have a password to change the BIOS (admin) check user password so that the password is asked at boot and that's just to enter the master password after which click for udanti password combination keys Ctrl+Enter.
If you press only Enter you boot, but the password will remain and you will always need to enter it the next time you reboot.
For the new line of laptops with a mask 2A7B, 1F5A, 1D3B, 1F66 to remove the administrator password does not need to set the password of the user (as is wrote above!!).
To remove the password of the administrator received the master password must be entered in the BIOS using the Unlock and after entering the password, press the combination of keys Ctrl+Enter at the same time.
Starting in 2005, DELL produces laptops have motherboard no external EEPROM - EEPROM is inside the keyboard controller, ie unlock as far as I know so far is possible only with a master password.