Inquiry About Latest Modem Firmware Version for TRB501

Networking Solutions Other
1

I am currently using a TRB501 5G Gateway and I am not experiencing any issues with it. However, I would like to check whether a newer modem firmware version is available for my device.

For your reference, here are the details of my current firmware:

Firmware version: TRB501_R_00.07.20.3
Firmware build date: 2026-01-21 13:43:19
Internal modem firmware version: RG520NEBDCR03A01M4G
Kernel version: 5.4.197-perf

In my experience, keeping firmware up to date can bring improvements in terms of bug fixes, stability, and overall performance, so I would like to ensure I am running the latest version.

At the moment, I do not require any remote diagnostics, log submissions, or troubleshooting, as there are no problems to report.

Could you please confirm whether a newer firmware version is available and, if so, how I can obtain and install it?

Thank you in advance for your support.

3

Greetings,

A newer firmware version (RG520NEBDCR03A02M4G) is available. However, if you’re not experiencing any issues, updating is neither necessary nor recommended. The installation process is not straightforward and would require a remote session with me or one of my colleagues to upgrade the modem firmware.

Best Regards,
Justinas

4

Hi Justinas,

Thanks for your reply.

I’ve already installed modem firmware updates on the TRB500 in the past using the standard procedure (uploading the file via GUI and flashing it), so I’m familiar with the process.

Could you clarify what is different with this release (RG520NEBDCR03A02M4G)? Is there a specific reason why it requires a remote session instead of the usual upgrade method?

Thanks in advance for the clarification.

Best regards,

5

I am currently running modem firmware RG520NEBDCR03A01M4G, which is an early baseline release. Given the known stability and performance improvements introduced in later versions, I would like to request access to the latest available firmware for testing and optimization purposes.

Version Type Key Improvements Key Fixes
A01 Baseline Initial 5G NSA/SA supportBasic LTE fallbackCore data interfaces (MBIM/QMI) N/A (initial release)
A02 Stability Update Improved 5G NSA stabilityBetter LTE fallbackEnhanced session recoveryUpdated MBN profiles Fixed “connected but no traffic”Resolved PDP drop issues
A03 Network Optimization Better SA/NSA switchingImproved network registrationEnhanced roaming behaviorRF tuning (EU bands) Fixed modem freeze under loadImproved SIM detection
A04 Performance Update Higher throughput (CA / EN-DC)Lower latency spikesImproved power & thermal management Fixed rare reboot under loadBetter low-power recovery
A05 Latest Stable Enhanced 5G SA stabilityImproved handover (mobility)Long-session stabilityBetter EU operator compatibility Fixed TX-only / no RX issueImproved watchdog recoveryUSB/driver fixes
6

Any news on this topic?

7

@Justinas @Vilius

Hi Justinas, Hi Vilius,

in cases where a TRB501/Quectel RM520N modem firmware update is authorized by Teltonika (with your remote session or TBR501 webGUI procedure), before applying it, is there a chance to backup QCN (specific calibration) and CEFS (Compressed Executable File System) as recommended by Quectel ?

Each module is calibrated before shipping from Quectel. Different module have different QCN file. You can get QCN file from other people having the same module or a generic one from Quectel support, but in both cases the performance will be worse than before.

My proposal is to document, in the Teltonika procedure manual, the procedure to perform these backups (manually) via shell / AT commands as well.

Tks, kind regards,

10

Greetings,

Apologies for the delayed response.

Please have a look at this topic: Modem Firmware Update guide for TRB501 RG520NEBDC

It provides the firmware file and the instructions on how to update the modem.

Best Regards,
Justinas