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262 Legrand PDU User Guide
3. Click Upload. A progress bar appears to indicate the upload process.
4. Once complete, information of both installed and uploaded firmware versions as well as compatibility and
signature-checking results are displayed.
If anything is incorrect, click Discard Upload.
5. To proceed with the update, click Update Firmware.
Warning: Do NOT power off the Legrand PDU during the update.
6. During the firmware update:
A progress bar appears on the web interface, indicating the update status.
The front panel display shows the firmware upgrade message. See
Showing the Firmware
Upgrade Progress
(on page 83).
No users can successfully log in to the Legrand PDU.
Other users' operation, if any, is forced to suspend.
7. When the update is complete, the Legrand PDU resets, and the Login page re-appears.
Other logged-in users are logged out when the firmware update is complete.
Important: If you are using the Legrand PDU with an SNMP manager, download its MIB again after the
firmware update to ensure your SNMP manager has the correct MIB for the latest release you are using. See
Using SNMP (on page 288).
Alternatives:
To use a different method to update the firmware, refer to:
Firmware Update via SCP
(on page 420)
Bulk Configuration or Firmware Upgrade via DHCP/TFTP
(on page 442)
Firmware Upgrade via USB
(on page 441)
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 PDUs, 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.