This read-write INTEGER (0-9) triggers a TFTP firmware download when set: values 1 through 8 target a single specific switch by its stack position, while 9 broadcasts the download command to every box in the stack at once. The object always reads back as 0 regardless of what was written, and the description flags a real side effect worth knowing: if RMON was enabled, triggering a download disables RMON collection until the switch or stack is next rebooted. An admin upgrading an 8-unit matrix stack in one shot would set this to 9 rather than repeating the set eight times.