After device detection, users can select the desired operation from the tool's menu. This could involve flashing firmware, running hardware tests, or configuring device parameters.
To get the tool to "work" (detect your device), you must put your hardware into Flash Mode Entering Maskrom Mode
contains a dedicated section (2.3.2) on using RKDevTool for eMMC flashing. for the latest drivers or a specific device-specific walkthrough