I’d like to purchase a TRB501 but I am a little concerned about the 5G modem instability that is being reported.
I’m just wondering whether the updated firmware that Teltonika is manually distributing fixes the instability?
Hi…
I don´t have the TRB501…
But… I have a RUTC50…
I update the box to RUTC_R_00.07.22.1
BUT… I don´t update the LTE MODEM… keeping it at RG520NEBDCR03A04M4G
and the device works very well.
I also, have RUTM56, running RUTM_R_00.07.22 and keep 5G LTE MODEM at RG520NEBDCR03A04M4G, and the device is very stable.
I would advice against purchasing the TRB501. Reasons: bad performance in bridge and passthrough modes, no FOTA updates are possible for the modem firmware.
If you want a similar Teltonika device, get a RUTM30 instead. It has the same modem, and the difference in price is negligible. You can disable the WiFi radio if you don’t need it.
Greetings, @Jagger ,
Thank you for checking before your purchase.
The 5G instability reported in the community is a documented issue, primarily linked to the internal Quectel RG520N modem firmware (RG520NEBDCR03A01M4G) rather than RutOS alone. Symptoms such as periodic reboots in 5G/4G/3G auto mode and “Device startup after unexpected shutdown” events have been observed across multiple firmware versions, and as recently as April 2026, isolated reports of 5G reboot loops persist on RutOS 7.22.1.
The current firmware releases are:
• Stable: TRB501_R_00.07.21.3 (2026-03-24)
• Latest: TRB501_R_00.07.22 (2026-03-25)
Please note that modem firmware updates on the TRB501 are not available via FOTA or the WebUI Package Manager - they require a manual package from Teltonika Support. If needed, we recommend raising a support ticket so our team can assess and provide the appropriate update.
If your deployment requires stable 5G operation without manual intervention, the RUTM30 may be worth considering - it uses the same modem, supports standard FOTA modem updates, and is similarly priced.
Should you have specific requirements (band configuration, passthrough/bridge mode, SA vs. NSA), feel free to share them and we can advise accordingly.
Best regards,
V.
Hi Vilius,
Thanks for your response. My intended use is as a failover WAN on a UniFi network so pass through/bridge mode are important to me. I’m aware of the pass through/bridge issues with the TRB501 however with my fairly slow 5G speeds (200/80) I don’t think it would be too much of a hindrance. Hopefully you will fix the issue via firmware some day.
Do you consider the modem firmware that you are currently deploying manually to those users with 5G instability issues, to be successful at stabilising the modem?
I’m also looking at the RUTM30 as well. I prefer the TRB501, but only if the modem is stable which I’m hoping the modem firmware that you are currently deploying has achieved.