"SYSTEM" showing on screen means that you have in fact put the device into preboot. What exactly are you trying to achieve? Flashing of a modified firmware as an RGN file via Updater.exe is usual reason and if that's what you're wanting then best to load the RGN to Updater first, follow this:
  • Load the RGN file to Updater.exe and leave it's GUI open and visible on your computer's screen, ensure to select the Radio Button next to 'USB Device'.
  • Ensure the device is fully OFF. If necessary hold the power button down for between 10 and 30 seconds until the screen goes completely blank.
  • Plug a 'known-good' USB cable directly into a REAR USB2 port of a desktop PC or a USB2 port of a laptop (no hubs, front desktop ports or USB3 ports).
  • Hold device screen firmly in appropriate place while plugging in the cable to the device's USB socket, watch the window adjacent to 'USB Device' for the device details to appear.
  • IMMEDIATELY you see the window populated either hit the enter key on your computer or click the OK button on the GUI.
  • Keep holding the device screen firmly until the flash finishes or at least until to you see 'Loader' or 'Software Loading' (or similar) appear on the device screen.