Installing DSA815 Options on units with Firmware 00.01.09.00.07 and Boot Loader version 00.01.03.
Note: It will NOT work for new Rigol production units with Firmware 00.01.09 and Boot Loader version 00.01.04.
*** Booting a Rigol DSA815 using a USB Drive (FAT32, without other files, or any directory) just a previous Firmware file in its root directory ***
For use when installing Rigol Options, etc that would not work/install with a newer Firmware.
This is how to re-load a previous version of Firmware when you can NOT install it per Rigol's Firmware Installation Procedure.
Inset a USB Drive in a DSA815 (that is known to function properly with the instrument) with a previous Firmware in the root directory.
When you first power up the instrument, a message should pop up in the lower left corner of the screen that says "Press 'Preset' (green button) to boot from U disk!". With the USB Flash drive installed, press the Green Preset button 3-4 times right after you Power ON the DSA815. With a USB Drive with nothing on it except for a firmware 'DSA800_UpdateFile.sys' file (in the Root Directory), the machine starts writing the file to itself while indicating its progress. After it finishes this write process, it continues on with its Boot sequence.
Then to insure that the Firmware installation has completed fully, repeat using the Rigol Firmware Installation Procedure.
When you are done with any required modification such as installing Rigol Options, etc. (that would not work before with the newer Firmware), you can reinstall the newer Firmware using the Rigol Firmware Installation Procedure.