The device must be in a state that RKDevTool can recognize, usually Radxa Docs Unbrick Rockchip RK3288 - Armbian forum
“What fixed it?”
The most common cause of this issue is a missing or corrupted Rockchip USB driver. Windows will not recognize the device in flashing mode without it. rkdevtool no devices found
What specific or Rockchip chip (e.g., RK3566, RK3399) are you trying to connect? The device must be in a state that