Thanks to the generous help of tv84 and drhex, I went back through the posts and found this very easy method to do the upgrade. You will need to install the Android SDK (
https://www.techspot.com/downloads/5425-android-sdk.html) and the Go compiler (
https://go.dev/) on your PC. Also download the rgtool.txt file for the DHO4000 series scopes (attached) and rename it to rgtool.go.
1) With your DHO4204 connected to the same network as your PC, use the Utility function on the scope to determine its IP address [scope-ip].
2) Open the Command Prompt program on your PC and send the following commands (you must specify Port 55555 when you connect):
.\adb connect [scope-ip]:55555
.\adb pull /rigol/data/Key.data
go run .\rgtool.go
3) Copy and paste the output of the Go compiler to any word processing document. The output will contain nine strings of SCPI commands, each having a unique option code consisting of of 96 characters after the "@" sign. It will look something like this (I've replaced most of the unique character strings with x's):
Generating options for HDO4XXXXXX
:SYST:OPT:INST HDO4000-EMBD@7451exxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:SYST:OPT:INST HDO4000-AUTO@686abxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:SYST:OPT:INST HDO4000-BW2T8@72eb8xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:SYST:OPT:INST HDO4000-COMP@a2526xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:SYST:OPT:INST HDO4000-AERO@1d28bxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:SYST:OPT:INST HDO4000-FLEX@145a7xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:SYST:OPT:INST HDO4000-AUDIO@b4e02xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:SYST:OPT:INST HDO4000-RLU@c5e67xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
:SYST:OPT:INST HDO4000-UPA@f71a7xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
4) You can now close the Command Prompt program if you wish.
5) Connect to the scope using your web browser pointed to the scope's IP address.
6) Using the SCPI Panel Control function, paste each individual option code into the SCPI command window and execute it. You can enter all nine option codes one after the other. There's no need to reboot the scope in between each option activation.
7) Enjoy!
I've attached a screenshot of my scope showing the activated options.
Thanks again to all who helped with this amazing upgrade. What a great group of folks we have on these forums!