Cannot Save Settings

When I try to update the default settings with “R/S” and “M” I get the message “Write Error”.
Is an SD card required to save new default settings?

I have no SD card, and when I turn on the Nano, I get a purple waveform. Is there any way to disable the purple waveform?

You don’t need a SD card to save settings, would you try upgrade the firmware and see if it’s working.

You may disable the purple waveform by adjusting the time base. Thanks!