If the operating system does not work, and the beaglebone AI will not load a new one. What do you do?

If the operating system does not work, and the beaglebone AI will not load a new one. What do you do?

You post a more complete error report.

Why doesn't the operating system work?
What does it do instead of "load a new one"?
How did you try to "load a new one"?