Ju
ne
20
18
238 Legrand PDU User Guide
A Note about Firmware Upgrade Time
The PDU firmware upgrade time varies from unit to unit, depending on various external and internal factors.
External factors include, but are not limited to: network throughput, firmware file size, and speed at which the
firmware is retrieved from the storage location. Internal factors include: the necessity of upgrading the
firmware on the microcontroller and the number of microcontrollers that require upgrade (which depends on
the number of outlets). The microcontroller is upgraded only when required. Therefore, the length of firmware
upgrade time ranges from approximately 3 minutes (without any microcontroller updated) to almost 7
minutes (with all microcontrollers for 48 outlets updated). Take the above factors into account when
estimating the PDU's firmware upgrade time.
The time indicated in this note is for Legrand PDU web-interface-based upgrades. Upgrades through other
management systems, such as Sunbird's Power IQ, may take additional time beyond the control of the PDU
itself. This note does not address the upgrades using other management systems.
Full Disaster Recovery
For Legrand, disaster recovery can be performed via the USB connection only.
If the firmware upgrade fails, causing the Legrand PDU to stop working, you can recover it by using a special
utility rather than returning the device to Legrand.
Contact Legrand Technical Support for the recovery utility, which works in Windows XP/Vista/7/10 and Linux.
In addition, an appropriate Legrand PDU firmware file is required in the recovery procedure.
Viewing Firmware Update History
The firmware upgrade history is permanently stored on the Legrand PDU. It remains available even though
you perform a device reboot or any firmware update.
To view the firmware update history:
1. Choose Maintenance > Firmware History.
Each firmware update event consists of:
Update date and time
Previous firmware version
Update firmware version
Update
result
2. If wanted, you can resort the list by clicking the desired column header. See
Sorting a List
(on page 86).