TRB501 Firmware Downloads

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This page contains firmware files for TRB501 devices. Look to the table below or the changelog to find download links.

Stable firmware - this version has been tested through both internal QA processes and large-scale user deployments. All known issues have been resolved based on user reports and testing feedback. Stable firmware is currently used as the default for updates and is also deployed in mass production. To upgrade firmware using WebUI, follow the instructions in TRB501 Firmware.
Latest firmware - this is the most recent firmware release, featuring the latest updates, features, and fixes. While it has passed internal testing, it has not yet undergone widespread deployment or user validation. It may still contain undiscovered issues. We recommend testing on a small number of devices before considering broader updates.

Note: packages for Package Manager are independent from firmware and can be downloaded in the Package Downloads page.

TRB501

File	Type	Release date	Size	MD5	Links
TRB501_R_00.07.18.3_WEBUI.bin	Stable FW	2025.10.30	22 MB	71c86f9c7eebf6e0b18f70d8ae3fce65	Changelog API
TRB501_R_00.07.19.4_WEBUI.bin	Latest FW	2025.12.05	22 MB	ab60ff2995f6fc18d21ec923197808c1	Changelog API
TRB501_R_SDK_00.07.19.4.tar.gz	SDK	2025.12.05	242 MB	263cda463404ff86d633f3dd530baa36

FW checksums

Checksums for firmware files can be found here.

Changelog

TRB501_R_00.07.18 | 2025.10.01

Note: This firmware version has been withdrawn due to a critical issue with incorrect mobile operator selection under specific conditions.

New
- Network
  - Mobile: added historical signal information display
  - Mobile: added "internet" APN for "Telenor" operator to APN database
Improvements
- Network
  - DHCP server: added option 82 support to DHCP relay
  - Mobile: added SIM switch historical data
  - Mobile: improved SIM switch status information
  - Network: enabled TCP segmentation offload for ethernet driver
  - SSHFS: updated mount point location
  - Dnsmasq: updated version to 2.90
  - Iperf3: updated version to 3.19.1
- Services
  - DLMS: improved COSEM value reading speed
  - DNP3 Client: added DNP3 client support for universal gateway
  - DNP3 Outstation: increased status report responsiveness
  - Input/Output: added "time" and "delay" options to I/O state change API endpoint
  - IPsec: added requirement for local certificate and key fields when X.509 authentication method is selected
  - IPsec: added improvements for IPv6 support
  - Modbus Client: increased test button and status report responsiveness
  - Modbus Client: made number zero as valid server ID
  - Modbus Client: added broadcast support
  - Modbus Server: increased status report responsiveness
  - Modbus Server: added broadcast support
  - MQTT Modbus Gateway: added broadcast support
  - OpenVPN: removed disabled state from "logs" and "active clients" when user has no write permissions
  - OpenVPN: improved error messages
  - OpenVPN: added user and password options for export client configuration
  - SMS Utilities: added a warning about enabled SMS limit
- System
  - Access Control: added JSON-RPC enable toggle
  - JSON-RPC: moved to Package Manager
  - Update Firmware: added event log item about modem firmware update
  - WebUI: added indicators when a form input inside an inactive tab was changed or invalid
  - WebUI: added "Skip to main content" accessibility feature
  - WebUI: improved multi select design
  - WebUI: improved styles of drag hint on smaller screens
  - WebUI: improved consistent formatting across all hints
Fix
- Network
  - Mobile: fixed excessive SIM switching after changing configuration
  - Mobile: fixed segmentation fault during SIM switching
  - Mobile: fixed APN database backup and restore functionality
  - Mobile: fixed configuring mobile data limit
  - Network: fixed interface settings change when framed routing is enabled
  - Network usage: fixed table columns visual bugs
- Services
  - Call Utilities: fixed answer action not triggering on second call
  - Data to Server: fixed Modbus input raw data sending when data type is Modbus PDU
  - Hotspot: fixed console errors that occurred in certain scenarios when enabling or disabling an instance
  - IPsec: fixed field validation to support % in custom options
  - Modbus Client: fixed PDU data type data collection
  - OpenVPN: fixed permissions for using IP Block
  - RMS: fixed RMS authentication under poor internet conditions
  - SMS Utilities: fixed mobile data usage display when mobile data is turned off
  - SMS Utilities: fixed incorrect 'Firmware on server' status message shown without internet connection
  - Stunnel: fixed disabled state of "enable" switch in overview page
  - Zerotier: fixed excessive ARP flooding on Zerotier interfaces
- System
  - Administration: fixed "User group" input validation
  - API Core: fixed double quoted boundary parsing
  - Kernel: fixed compilation of 'fs-cifs' kernel module package
  - Profiles: fixed endpoint response when calling from internal API
  - UI Core: fixed 'Save & Apply' button reachability on mobile devices
  - Update Firmware: fixed incorrect FOTA address in SDK
  - WebUI: fixed text-area width issues on small screen devices
CVE Patches
- CVE-2025-6021
- CVE-2025-32415
- CVE-2025-49794
- CVE-2025-49796

TRB501_R_00.07.17.5 | 2025.09.30

Improvements
- Network
  - Mobile: added ability to download eSIM profiles via Setup Wizard
Fix
- Network
  - Mobile: fixed possible hang when downloading eSIM profile
  - Network: fixed assigning interface to incorrect firewall zone when changing its settings

TRB501_R_00.07.17.4 | 2025.09.17

Fix
- System
  - Profiles: fixed keep-settings execution for older profiles

TRB501_R_00.07.17.3 | 2025.09.05

Improvements
- Services
  - Tailscale: updated version to 1.86.2
Fix
- Services
  - Web Filter: fixed host blocking with hotspot interfaces

TRB501_R_00.07.17.2 | 2025.09.02

Fix
- Network
  - DNS: fixed saving of DNS server IPs
  - Mobile: fixed SIM switch rule triggering unexpectedly due to NTP time adjustments
  - Network: fixed random network interface MAC address bug
- Services
  - Tailscale: fixed package installation
  - Tailscale: fixed dns resolution errors caused by enabling MagicDNS
- System
  - Backup: fixed keep-settings execution for older backups

TRB501_R_00.07.16.6 | 2025.09.17

Fix
- System
  - Profiles: fixed keep-settings execution for older profiles

TRB501_R_00.07.16.2 | 2025.07.24

Initial firmware release