This is the most reliable method.
Once you see the fastboot screen, you can interact with your phone using your PC. Here are the common commands (type these in the same terminal where adb worked): How to Open Bootloader Mode on NOKIA 5.4
The Nokia 5.4 is a solid mid-range device known for its clean Android experience and sturdy build. However, for tech enthusiasts, power users, and developers, the out-of-the-box experience is just the beginning. To truly unlock the potential of your device—whether you want to root it, install a custom recovery like TWRP, or flash a custom ROM—you must first understand how to access the Bootloader Mode. This is the most reliable method
: Completely shut down your Nokia 5.4 by holding the Power button and selecting "Power off". for tech enthusiasts