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In some cases its removing the CMOS battery inside the laptop and powering on with no main battery and no charger connected. Before putting it back together. The CMOS will not only loose the password, but it will also loose its settings including the time and date.
If you can load the laptop otherwise, Toshiba used to offer a windows tool for changing some CMOS options including unconditionally changing the password.
use old battery first try to boot
if your system is boot run bios update from intel.com
then change new battery
else run bios flash from chip level service provider
Most likely the CMOS (Bios battery), which is a small silver coin shaped battery on the motherboard needs changing. This maintains the correct time when the laptop is switched off. They last for up to 3 years then need replacing. (example in picture)
look on back of laptop you will see some panels under panels you will see two little wires connected to mother board that's the cmos battery unplug it and change it
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