How can I enter into emergency mode, using adb or command or any application, without pressing down volume button. Because, my device's volume down button is broken.
After installing appropriate usb drivers, and enabling usb debugging in developer options in your device. Enter this code to reboot in recovery/emergency mode (don't know if that term is specific to your device):
adb reboot recovery you should boot into recovery mode.
If successful you should see a number of options:
try navigating the options with the other vol button and power button as "enter"