For Linux host: lsusb result: Bus 001 Device 112: ID 2207:330c Fuzhou Rockchip Electronics Company.
Please check this guide, Install rockchip flash tools, rkdeveloptool/RKDevTool, under Windows/Linux/MacOS PC. USB Male A to Male A cable(important) USB C to USB A cable does not working on all PCs.We use tool rkdeveloptool in Linux/macOS and RKDevTool tool under Windows.
The Linux/macOS PC tool we use to communicate with ROCK Pi 4 in Maskrom mode are the rkdeveloptool and RKDevTool. ROCK Pi 4 supports Maskrom mode, which is a special operation mode for CPU to wait for USB OTG port command. 1 Install image to eMMC from USB OTG port.