DSO2D15: no trace + no reaction to buttons after swithing to 8Mpt buffer

Sserlet

Hello,

I recently bought a Hantek DSO2D15. I switched the buffer size from the default 4kpt to 8Mpt, and since then I have no trace on my DO (I do see the labels), and it does not react anymore to any button or knob.
I did several times a power off and power on again, but with no effect: the screen comes up with all the labels, but there is no trace, and it does not react at all to pushing buttons or turning knobs.

Is there a way to restore it to default setup? Needless to say that the button "default setup" does not work, so I would need another way.

Stefaan

Sserlet

I have sent you an E-mail. Thank you for your help.