If the hardware keys are broken or unresponsive, or if you are already connected to a computer for development purposes, you can use the Android Debug Bridge (ADB) command line.
If your device is powered on and connected to a PC with installed, you can trigger the reboot through a command line. how to open bootloader mode on nokia 14
To enter bootloader mode on a , you typically need to use a physical button combination while the device is powered off. If the hardware keys are broken or unresponsive,