AltoPlex firmware version 4.4.0
Downloads
| Radio Models | Firmware Download |
|---|---|
| D621, P621 | kb_sw-prod-NOMAD-4.4.0.zip |
| C423, C420, C410, P421 | kb_sw-prod-DEVO-4.4.0.zip |
| K60DN | kb_sw-prod-K60DN-4.4.0.zip |
| K60CN1 | kb_sw-prod-K60CN1-4.4.0.zip |
Release Notes
Released January 2, 2026
PDF version of release notes
The 4.2.0 version of embedded code for AltoPlex devices is generally available. This version can replace existing AltoPlex software version 4.2.0 or earlier. These notes include features from version 3.9.1 to 4.2.0.
New features and enhancements
Disable read-only WebUI and REST API
AltoPlex devices now include the Allow read-only web access parameter on the Admin tab, which is used to disable read-only access to the WebUI and the REST API. 
- When the Allow read-only web access parameter is enabled:
- Most information in the WebUI is viewable without being logged into the device.
- Read-only REST APIs do not require user authentication.

- When the Allow read-only web access parameter is disabled:
- The WebUI presents the user with a login dialog to enter the admin password.
- Until the password is entered, no device information is visible other than the device name and description.
All REST API commands except device/node_identity and device/device_status require user authentication.
Limitations fixed in this release
- The user is now warned that a reboot will be performed when only the SSID and not the passkey is changed through the WebUI.
- Fixed an issue where baseband asserts caused kernel panics on the D423 when configured as a DN in PtMP mode.
- The asserts that caused the kernel panics happened while traffic was running. Some other asserts may still happen on the D423 when configured as a DN in PtMP mode when the device is idle and there is co-channel interference.
- Fixed an issue on the wifi logger for the D423.
- Fixed an issue where an island condition was created from a misconfiguration when a remote distribution node was incorrectly added as a CN responder.
Ongoing limitations
The following issues have been identified by test or reported and may appear during use:
- When VLANS are enabled, the L2 max frame size in the downlink direction is only 1592 instead of 1596.
- Link quality is occasionally degraded after beam refinement.
- DN link fails to come up after polarity change.
- This is specific to DN links where the responder is also an initiator for one or more CN links.
- To recover from this issue, remove all CN links from the responder DN sector, then wait for the DN link to come up, then add the CNs back.
- This issue can be prevented by removing all CNs from the responder DN sector, then making the polarity change to both DNs, then waiting for the DN link to come up, then adding the CNs back.
- K60DN beam angles in radio status may be incorrect when different elevation settings are used between sectors.
Release history
| Version 4.2.0 | November 7, 2025 |
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New features and enhancements
New options to set the 60 GHz airlink SSID and encryption passkey have been added.
New REST APIs and CLI commands have been added to perform a topology scan on a local device to discover nearby radios without knowing their MAC addresses or GPS locations.
A new Link State parameter is displayed as part of the wireless status information in the WebUI. Link State combines the status of the link with the link uptime or downtime. Values are:
For all AltoPlex devices that have the management Wi-Fi feature (currently the D621, P621, P421, and D423), the new Hide SSID configuration parameter allows you to configure the management Wi-Fi to not broadcast its SSID.
Limitations fixed in this release
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| Version 3.9.1 | August 11, 2025 |
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New features and enhancements
Limitations fixed in this release
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| Version 3.6.0 | May 02, 2025 |
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New features and enhancements
Note: Heading is determined by the radio's magnetometer. The magnetometer is sensitive to nearby iron objects, such as metal poles, which can cause the reported heading to be inaccurate. As a result, the reported heading should be used to observe changes in the radio's heading over time (assuming no variation in the amount of iron near the radio), rather than an absolute indicator of the radio's heading.
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| Version 3.3.1 | February 02, 2025 |
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New features and enhancements
Limitations fixed in this release
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| Version 3.2.1 | January 22, 2025 |
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New features and enhancements
Limitations fixed in this release None |
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| Version 3.2.0 | December 18, 2024 |
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New features and enhancements
Limitations fixed in this release
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| Version 2.7.3 | September 24, 2024 |
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Initial release of the D621, C420, C410, P621, and P421 radios. For information about the 2.7.3 release, and prior releases, for the K60DN and K60CN1 radios (AltoPlex products that are no longer being sold), see support.altowav.com. |