401 Unauthorized is very strange, it should not have this error at all. ‘Check Device Password and Try again’ is related to device password. You can bypass password by using buttons: power off the controller, then press and hold the third pushbutton (B3) while powering it back on, continue holding B3 until the LCD displays ‘Setup Options’. Then click B3 many times until you see ‘Ignore Password’, click B1 to select Yes, and finally press and hold B3 until the controller reboots. This is equivalent to check ‘Ignore Password’ in the UI. See if this helps.