Undocumented (and broken) DXOS command

While trying to do an upgrade on a DX, I found a command that is not referenced in the command ref, or when you use the “?” at the CLI.

Upgrade of Juniper DX3200 to 5.2.4

Here’s what to do to get a DX application acceleration engine upgraded. Note that you will need serial access to the device in the later stages of this procedure: