Today I had an issue updating the firmware in my H115i Elite Capellix liquid cooler. I thought for sure the firmware update failed. After iCUE 4 updated the firmware, the device completely disappeared even though iCUE indicated a successful update, but the device was no longer recognized by the system.
I eventually went into device manager and found a “Generic USB Hub” device with a yellow exclamation point. I uninstalled the device and then scanned for hardware changes, and it recognized the cooler again. Problem solved!