26.x -March 2026, LTS
Important release information
DAL OS firmware update guidelines
Digi recommends the following guidelines when updating DAL OS firmware:
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Use Digi Remote Manager
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Review the notes for each release to understand the differences between firmware releases. Doing so helps you avoid unexpected behavior changes, assesses impact on your devices, and plan updates with proper testing and confidence.
Known issues
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TX54 product models
The Serial status and statistics for the TX54 are incorrect on the Web UI and CLI (DAL-5763].
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Bridging traffic from devices connected on an Ethernet port or Wi-Fi AP
Due to the changes in the firewall, it is currently not possible to bridge traffic from devices connected on an Ethernet port or Wi-Fi AP in a bridged interface to a remote IP device via a gateway connected to an Ethernet port in the same bridged interface [DAL-9799].
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IPsec using Default Router as the Local Endpoint
There is an issue with IPsec where the tunnel will not come up when the default route is used as the Local Endpoint and the tunnel is not acting as the initiator. Specifying the interface type for the local endpoint should resolve the issue. [DAL-11361].
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SSH / SCP login slow when FIPS mode is enabled
Logging into SSH or SCP when FIPS mode is enabled can take more than 20 seconds. [DAL-12606].
Primary Responder mode considerations
DAL OS 23.9 and later supports a PR Primary responder mode that can be enabled on any device. When enabled, the device acts as a Primary Responder PR device with a security-hardened, feature-restricted firmware targeted to comply with AT&T FirstNet® and Verizon ResponseVerify™ security requirements.
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Features not available |
Features available but disabled by default |
Features enabled when PR mode is enabled |
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Telnet |
SSH* |
FIPS mode |
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Raw TCP listeners for serial ports |
Wi-Fi pre-configured access points |
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Wi-Fi WPA1 encryption |
Internal serial console port |
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Backup configuration file restore |
USB ports |
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*For DAL OS 25.8 feature release and newer, Primary Responder mode now requires key-based SSH authorization. |
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Additional considerations
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Users are prompted to enable two-factor authentication.
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A notification will appear in both the Web UI and CLI if the DAL device has Primary Responder mode enabled, but there are local users who do not have two-factor authentication enabled.
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The system custom-default-config CLI command available in release 24.12 cannot be run in Primary Responder mode.
Cellular devices that use DAL OS firmware
The following is a list of devices that run DAL OS firmware, each with a link to its product-specific user guide.
Step updates
If your devices are running a firmware version earlier than 24.6.17.54 and you want to update them to version 24.9.79.151 or newer:
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Do a step update to version 24.6.17.69.
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Proceed with updating to newer versions.
DAL OS Long Term Support firmware strategy
DAL OS uses a structured release strategy that combines stable LTS Long Term Support releases with more frequent feature releases, allowing you to balance reliability with access to new capabilities. The following resources provide additional guidance to help you understand release types, plan updates, and manage your devices effectively: