No, that will not work, sorry, but we only use that command to reach fastboot reliably.
You can already get to fastboot by button press.
adb and fastboot are different languages, only fastboot is likely to be available useful to you, from what you said so far.
You can also boot into fastboot mode via a key combination:
- With the device powered off
- hold Volume Up + Power to open the menu. Use Volume Up to navigate and Volume Down to select. Select Fastboot Mode
When I see this mention of a menu, be careful not to take a wrong turn ! 