plugin the USB3.0 A-A cable into the interface on the upper layer of the blue USB3.0 socket,
open the “RKDevTool_Release”,
hold the recovery button, click the reset button, when the RKDevTool found device, release the 2 buttons
Click the Upgrade Firmware tab, click the Firmware button to select the firmware, and click the Upgrade button to upgrade
Wait for the upgrade to complete. Remember not to cut off the power or unplug the data cable during the process, otherwise the upgrade will fail or even damage the CM68.