Try this steps given below-
Restart the computer.
Press and hold the CTRL + ESC key on the keyboard until the BIOS Recovery page appears.
On the BIOS Recovery screen, select Reset NVRAM (if available) and press the Enter key. Select Disabled and press the Enter key to save the current BIOS settings.
Select Recover BIOS and press the Enter key to start the recovery process.
The CTRL + ESC key combination can be used to trigger BIOS recovery on computers where an external keyboard is the primary input. This applies to Dell desktops, all-in-one computers, and laptops. The supported keyboard types on these devices are:
PS/2 keyboard
USB keyboard
Bluetooth keyboard - If BIOS has POST support for system-specific Bluetooth keyboard. Dell recommends using a USB keyboard for the BIOS recovery process.
Regards,
Rachel Gomez