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PDU firmware upgrade
APC UPS Data Center & Enterprise Solutions Forum
Schneider, APC support forum to share knowledge about installation and configuration for Data Center and Business Power UPSs, Accessories, Software, Services.
"For any devices, including Rack PDU, as long as they are operating normally and you have no active alarms we should check prior, a firmware upgrade of the management interface done through any method, including DCE, will not power on/off any attached loads."
But, as discussed in the post, there are fault states, that when active in the PDU, can cause the PDU to stop delivering power.