If you have loast the password, to reset the BIOS password you need to
remove temporarily the CMOS battery , so to reset BIOS settings.
Some model may be using NV Ram, in that case removing the battery is not enough.
The battery is located on the lower side on the motherboard.
On many DELL models the battery can be accessed from the side of DVD slot, battery slot, or RAM slot, without disassemblying the laptop.
On some model you may need complete disassembly (eg. Dell Le series).
The battery usually looks like a couple of coin batteries wrapped in plastic and connected to motherboard by a two wires connector.
Before disassemblying or removing covers, always unplug adapter and remove battery.
Several Dell Laptop can be set to use NV Ram to store the password.
In this case the problem cannot be solved removing primary battery, then accessing and removing CMOS battery for few minutes.
If you still cannot reset you have two way out.
Disassemble completely and access the NVRAM microswitch, or
contact Dell and get master password.You can also try one of this standard Dell factory CMOS password:
ALFAROME
BIOSTAR
biostar
biosstar
CMOS
cmos
LKWPETER
lkwpeter
setup
SETUP
Syxz
Wodj
Dell
