Can't get to the boot menu for my Quest2

I want to do a factory reset from the headset.  I power off the headset, press both the power and volume buttons at the same time and wait for the boot menu to appear, but it never does. Instead, I get a little yellow robot on its side with a red triangle with an exclamation point inside. Under the robot are the words: "No Command".

Can someone explain what's going on here? Do I have a hardware issue? Firmware issue?