I was an idiot and tried the following procedure to firmware upgrade:
- Turn scope off.
- Turn scope on.
- Wait for Rigol LOGO and 1 beep.
- Press Help 3 times.
- <something good happens here>
Instead of that, all of the CH buttons lit up, the scope speaker generated a continuous tone, and it
destroyed my USB drive! Yes, you read that right. Now the nice high-speed 32GB USB drive I put the firmware on won't even connect to any device or computer I try.
I thought that this had messed up the USB interface on the scope, too -- because afterward, it did not recognize other USB drives. But a power disconnect and reconnect fixed that.
Anyway, I've upgraded using the normal procedure. I'll report back later.