Release Date:
November 12, 2026.

Enhancements:

• Added the snmp-server fast-cache server enable CLI command and SNMP set support to enable faster updates of fiber-optic data to SNMP.
• Added the prioritize switch-destined arp CLI command to prioritize ARP packets destined for the switch.
• Added support for LED Dark Mode on M4250 switches.

The following table lists the SNMP OIDs that support the LED Dark Mode:

Bug Fixes:

• Fixes the issue where the DHCP server on the switch did not assign IP addresses to some clients, such as roaming wireless clients, while it was receiving other ICMP traffic. [CE-7587]
• Fixes the issue where the switch rebooted unexpectedly because of a crash in the ARP callback task while it was sending ICMP error messages. [CE-7633]
• Fixes the issue where the switch crashed in the MSRP task when AVB, PTP, DHCP and IGMP traffic started at the same time. [MS-5504]
• Fixes the issue where the output of the show ip pim statistics command was misaligned. [CE-7569]
• Fixes the issue where SFP optical readings reported through SNMP were out of sync with the CLI after an SFP port was shut down and enabled again. [CE-7687]
• Fixes the issue where the PVID Port Configuration page showed None in the Untagged column for trunk ports, even though VLAN 1 was the native untagged VLAN. [CE-7876]
• Fixes the issue where Insight showed incorrect port authentication states and stale client and topology information for Insight-managed switches. [CE-7831]
• Fixes the issue where IGMPv3 fast-leave did not work because the switch ignored IGMPv3 Block Old Sources reports, which caused video disruption when receivers changed multicast sources. [CE-7737]
• Fixes the issue where hosts intermittently received Destination host unreachable responses for one to two seconds when sending traffic through the switch. [CE-7940]
• Fixes the issue where the 802.1X guest VLAN was not assigned to 802.1X-unaware clients when the port host mode was multi-domain multi-host. [CE-7665]
• Fixes the issue where multicast groups could expire intermittently when IGMP Plus was used with IGMP report suppression. [CE-8090]
• Fixes the issue where PTP sync interval instability caused Milan AVB clocks to flap. [MS-6226]
• Fixes the issue where DHCP L2 relay inserted an incorrect Option-82 circuit-id or remote-id. [MS-6037]
• Fixes the issue where the web UI could not delete an OUI-based VLAN entry. [MS-6033]
• Fixes the issue where a password strength exclude keyword could not be created through SNMP set. [MS-6023]
• Fixes the issue where the show lldp remote-device command did not show the OUI and OUI subtype of organizationally specific TLVs. [MS-6012]
• Fixes the issue where the RSTP max-age setting accepted a value that conflicted with the hello time. [MS-6156]
• Fixes the issue where the output of the show ipv6 pim statistics command was misaligned. [MS-6067]
• Fixes the issue where the auto-trunk native VLAN was not renegotiated after the management VLAN changed, which caused switches to go offline in Engage. [CE-7918]
• Fixes the issue where the Last TCN label on the MST configuration page was unclear. [CE-7880]
• Fixes the issue where a PoE 802.3bt port that was set to 802.3at with a 32 W user power limit did not deliver power correctly. [MS-4984]

AV UI Known Issues:

• After a configuration clear, the original VLAN 1 profile remains for up to 1 minute the first time you login. All configurations are cleared and there is no functional impact.
• If a PoE schedule is applied to the same port multiple times, only the most recent schedule takes effect. The device UI might display a conflicting schedule as active, but this status is not valid.
• gPTP Clock Master Causes Time Drift with AVB MILAN Devices:
  If the switch becomes the gPTP clock master, time drift issues might occur when AVB MILAN devices are in use.
  Workaround: When creating an Audio Video AVB MILAN profile in AVUI, set the Local Clock Priority 1 and Priority 2 values to 255 to prevent the switch from acting as the clock master.
• Stale Spanning Tree Configuration After Firmware Upgrade from AVUI 2.2.13.29:
  When upgrading firmware from AVUI 2.2.13.29 to the current release, access port configurations with no spanning-tree port mode might persist. If Dante devices are connected using redundancy ports, this can cause a network loop.
  Workaround: Manually clear the stale configuration by setting the affected interfaces back to spanning-tree port mode.
• Kramer AV Single-VLAN Profile Cannot Be Modified When Using VLAN 1:
  If a Kramer AV profile is created with a single VLAN and that VLAN is VLAN 1, the profile cannot be modified to another single-VLAN profile.
  Workaround: Use a VLAN ID other than VLAN 1 when creating a single-VLAN Kramer AV profile.

Firmware Known Issues:

• This firmware includes a configuration migration process that transitions the default web browser protocol from HTTP to HTTPS. When you upgrade to this firmware and import an older configuration with HTTPS disabled, HTTPS becomes enabled.
  Workaround: Reconfigure the web browser protocol settings manually after you perform a firmware upgrade or import an older configuration.
• The first time you log in, you must set up a password to access the switch. However, if you access the main UI before you set up a password and simultaneously set the password in the AV UI, the switch console might lock for up to 15 minutes.
  Workaround: Configure a password in either the main UI or the AV UI to avoid this lockup issue.
• If you upload only the private key or the certificate before you enable HTTPS, the system enables the HTTPS service but it fails to operate correctly because the configuration is incomplete. A factory reset does not fix this issue.
  Workaround: Make sure that  both the private key and certificate are fully uploaded before you enable HTTPS. If the issue still occurs, remove the incomplete HTTPS-related private key or certificate, and disable HTTPS before reconfiguring.
• For up to 20 minutes after a factory reset, CPU utilization runs at full load while the SSL key is being generated.
  Workaround: wait ~20 minutes — CPU utilization returns to normal once key generation completes.
• With PIM and IGMPv2 snooping configured, multicast traffic might be sent to the CPU every 4 minutes. This can cause an intermittent black screen or loss of video and audio for inter-switch multicast traffic routed by PIM. 
  Workaround: Downgrade to firmware version 13.0.5.26 or contact NETGEAR Technical Support. The next firmware release fixes the issue.

Warnings:

Read and follow these warnings before updating your firmware:

• SNTP is deprecated in firmware versions 13.0.5.10 and later, and NTP is introduced. Configure an NTP server in your network. Remove SNTP-related settings from the configuration file on firmware version 13.0.4.x before you apply it to the switch running firmware version 13.0.5.x or later.
• HTTPS is set to the default web browser protocol from firmware version 13.0.5.20 and newer versions. The default certificate is self-signed, so you might encounter a browser warning when you log in. To avoid this warning, you can download your own certificate issued by a trusted Certificate Authority (CA).

General Information:

• This switch firmware upgrades the boot code to version 1.0.0.13.
• The process of upgrading the firmware and boot code takes about three minutes. Apply the update bootcode command from the command line interface. Do not switch off or restart the device during the upgrade process.
• AppMgr remains with existing version 1.0.7.19 in this switch firmware.
• Insight and Engage/AV UI are mutually exclusive. This means you can only use one of these options to configure and manage the switch, not both.
• If the encrypted password in the configuration file does not adhere to the NETGEAR password policy, when the configuration file is loaded on the firmware version 13.0.5.16 or later, you must create a new password during the initial login.

Download Link:  https://www.downloads.netgear.com/files/GDC/M4250/GSM421xxx_MSM4214X_XSM4216F_V13.0.7.6.zip

Firmware Update Instructions:

To update your product’s firmware, follow the instructions in your product’s user manual. To find your user manual, visit https://www.netgear.com/support/enterprise/, enter your model number in the search box, and click the Documentation button on the product page.