For Linux host: lsusb result: Bus 001 Device 112: ID 2207:330c Fuzhou Rockchip Electronics Company.For macOS host: lsusb result: Bus 000 Device 004: ID 2207:330c Fuzhou Rockchip Electronics Co., Ltd. Confirm that ROCK Pi 4 is in Maskrom mode. Power on the board and release the maskrom key(important) Press and hold the Maskrom key if your board is Plus version with soldered eMMC (1: Reset 2: Maskrom 3: Recovery) Plug the USB Male A to Male A cable to ROCK Pi 4 OTG port(the upper USB3 port), the other side to PC Insert removable eMMC module ( Skip this when there in one eMMC on board) Short-circuit SPI Nor Flash if there is one SPI Nor Flash on board. To boot ROCK Pi 4 into maskrom mode is simple: 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.
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