If the current user is not the original Latitude owner, Dell will transfer the used Latitude’s registration from the original owner with only the Service Tag and Express Service Code from the tag on the laptop. Dell Technical Support will request the Service Tag and Express Service Code from the bottom of the Latitude. The official method is to contact Dell Technical Support.
CmosPwd give equivalent passwords for Award BIOS, not original one. SOYO motherboard have "SY_MB" as master password for Award 4.51. AWARD 4.50 have a backdoor, a generic password : AWARD_SW. Acer Travelmate 6592g: Disconnect the yellow cmos battery (near the DVD bay but hard to access) and reconnect it after a few hours, hold F2 during first boot. Acer Travelmate 280: search for SW1 switch on the motherboard and enable the switch 3 to disable the password request. Acer Aspire 1522: Under the keyboard, search for switch SW1 on the left of the fan jack, switch the pin 1 to on, turn on the notebook, press F2 and set a new supervisor password, turn off and switch back SW1. To fill the eeprom with zero or FF, don't forget the reset the cmos. If you don't see the password, you can try With the eeprom programmer, backup your eeprom and run cmospwd /d /l eeprom_backup. You can desolder the eeprom with hot air or you can try to "clip" the eeprom. You can get/buy eeprom programmer in electronic shops or labs, you need another PC to use it. cmospwd /k) and if the password is really stored in an eeprom, you won't be able to boot anymore. You need an eeprom programmer/eeprom reader (electronic device) to retrieve the password. 
On laptops, the password is usually stored in an eeprom on the motherboard and not in the cmos.
Hints for various manufacturers Unlock code generator To get information about new CmosPwd release or development, subscribe to cmospwd. DOS/Windows 9x and Windows NT/W2K/XP/2003/.CmosPwd is free, it's distributed under GPL
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