(kernel) Kext not found for unload request. Failed to unload - (libkern/kext) not found.
When done, click Unload Kext to remove the kernel. Click Show Fw Version to make sure the update was successfull.
Click Update FW to update the firmware of your device. Click Set Bin file path and locate the firmware that you have just downloaded (*.bin file). Failed to unload - (libkern/kext) kext is in use or retained (cannot unload).