This documentation is designed to provide guidance to customers on how to 
upgrade the DHO800/900 series digital oscilloscope to the version in the 
"DHO800_DHO900(Software)Update.rar" file. 

 
New versions of firmware are available at the following website:
https://www.rigol.com/products/oscillosopes/DHO800_900.html

[Notices]

    - Before upgrading, please carefully refer to the 
      "DHO800/900 Release Notes.txt" file to obtain the updated information of
      the firmware version. 
      
    - Please make sure your USB disk can be read correctly. DHO800/900 series 
      is required to use a USB Flash drive disk with FAT32 format. 
      
    - During the upgrade process, please do not cut off power and pull out the 
      USB disk, otherwise the instrument will fail to work normally.
       

[Upgrading Procedures]

    1. Copy the upgrade file DHO800_DHO900_Update.GEL to the root directory of the USB
       disk. 
       
    2. Keep the instrument in the power-on state, then insert the USB disk into
       the USB HOST interface (next to the Power key). 
       
    3. Enter the Storage module from left-down entry