Here is a step by step procedure for setting up the USB upgrade scenario for the WFM7120 Series.
 
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1.  Download the software zip file to a convenient directory on your PC.
    Unzip.  You should have two files.  Transfer.exe and firmware.pkg
  
2.  Attach the USB stick to your PC.  Use Windows File Explorer to observe that the
    device shows up in the file menu.

3.  Create a folder on a USB stick called WfmUpgrd.
    Note - If there are additional files on the USB stick, please delete most of them.
    The WFM upload process will have problems if there are more than about 32 files present.
    You may, in some circumstances, need to re-format the USB drive and start over - by 
    creating the new folder named "WfmUpgrd".  (without the quotes, of course)

4.  Copy the firmware.pkg file from the previously downloaded and unzipped files to this 
    new folder.

5.  Safely Eject the USB stick from the PC

6.  Insert the USB Stick into the front of the instrument
    Press the MAIN button and check the Mount/Un-Mount status.  (If the USB was  
    successfully mounted, this menu will show your next choice as Un-Mount".)
    Press the MAIN button again to dismiss this menu.

7.  Press the CONFIG button to enter the Configuration menu.  
    Scroll down, using the arrow keys or general knob, to the Utilities menu. 
    
    If this waveform monitor is an older WFM7100 series, use the appropriate
    touch screen menus to navigate to the System Upgrade menu.  Bypass 
    steps 8, 9, 10.  Change step 11 according to the menus presented. 
     
8.  Press the right arrow key to enter the next sub menu.

9.  Scroll down, using the arrow keys or general knob, to System Upgrade.

10. Press the right arrow key to enter the next sub menu.

11. Scroll down to USB Upgrade and press the SEL (Select) button to enter the upgrade
    process.

    If the USB stick is mounted correctly and the firmware is detected, a pop-up message
    Will appear to Accept the upgrade process and continue.  Otherwise select Cancel
    to exit the upgrade procedure.

12. Once the upgrade process starts, it will take about 10-12 minutes to load the
    firmware. 
    NOTE - DO NOT power down the instrument during this process.  Let it run through
    To completion - which will be reported on screen.

13. Once the process is complete a on-screen message will appear to remove and re-apply
    power to complete the upgrade process.
 
14. Once powered up the unit will be upgraded.  Check to see the new version number
    in the Config Menus.  

15. Last thing – if the display seems a little uncertain.  Press and hold the PRESET
    button perhaps 2 seconds, until a new Preset selection menu appears in the active
    tile.  Navigate to the Recall Presets, and then select the Factory Preset option.
 
16. For USB data safety PLEASE go back to the MAIN button and electrically Un-Mount
    the USB before you physically remove it from the instrument.