Update APC NMC3 firmware versions prior to 2.3.1.1
Firmware update
How to update the firmware on APC devices monitored by your EcoStruxure IT Expert organization. Firmware updates are available as soon as they’re released.
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In NMC3 firmware versions prior to 2.3.1.1, database corruption can occur which causes the NMC3 to become stuck in a reboot loop or stuck at the boot monitor, indicated by its orange status LED.
Schneider Electric advises customers to update the firmware on their NMC3 devices to the latest version. See Firmware update in IT Expert
If this issue is ongoing, see instructions for how to resolve in APC FAQ FAQ000262012.