will not recognise usb, and date time keeps resetting

  • Hi, just received amp back from repairers (new front board for led fix), and I couldnt connect to rig manager, so tried to update head firmware via usb drive, and both my drives are not recognised at all by the kemper, so i purchased a brand new usb drive and still does not recognise anything being inserted. Also keeps asking for date and time, (keeps resetting after being off), current version firmware is 7.0.9.15094


    I have also tried reformatting usb drive to different formats, nothing is recognised :(, can not use rig manager.