Installed ultra sigma on my pc
Used Ultra Sigma entering command below.
:SYSTem:OPTion:UNINSTall
After this command, restarted the rigol, and it was in demo mode again. However, as you can see the countdown timer continued counting down.
Finally, entered the right code without 500 uV. (Did all the codes seperate, and checked them in installed options. DSER should do it at once) Hope this helps you...
By the way, after upgrading later to newest firmware, you also see its a 100 Mhz scope...