Power on the laptop. When prompted on screen, press 'Enter' to interrupt startup. Follow the remaining on-screen prompts to enter the system setup/BIOS menu.

After the CMOS battery replacement, the laptop may need to be plugged in to the charger when power on for the first time after the replacement.

Follow the on screen prompts to navigate to the Date/Time page of the BIOS and set the current date an time.

Follow the on screen prompts to save any changes and exit the BIOS.