Hello.
I recently bought TRB500 5G gateway. I already managed to update the firmware version from the server, but not the internal modem firmware. When I try to update the internal modem it is just grayed out and informs: “Modem updates from the server are not supported for this device”. Where I could find new firmware for the internal modem?
Sorry for my bad English 
Hi, @Reissumies
Welcome…
Teltonika, only provide a link to download the firmware of the device. (rutos)
https://wiki.teltonika-networks.com/view/TRB500_Firmware
https://wiki.teltonika-networks.com/view/TRB500_Firmware_Downloads
The only way to download a firmware for internal lte modem, is using the web of the device. (the way that you are doing)
@Marcelo.Barros thank you for your answer.
I don’t know if I’m doing something wrong then. Here is screenshot from the update page.
There where also another discussion about internal modem update, but it was already closed. Here is link for that discussion.
TRB500 can only be updated by going through Teltonika Staff.
They will ask you why you think you need/want this update and then they will guide you through the process.
No official download available for TRB500 modem firmware.
I found the helpdesk, but it’s just dedicated for the clients who bought the device directly from Teltonika. I have bought all my Teltonika devices from the suppliers.
Maybe I try to find a way to send an email directly to them.
@Martynas Can you help here?
Hello @Reissumies,
Could you clarify few things regarding mentioned internal modem update:
What is the reason for the need to upgrade your modem firmware?
Could you provide your current TRB500 modem firmware version (this can be checked in Status → System page)? It’s possible that you already have the latest version.
Have you noticed any mobile connectivity issues with the current modem firmware?
Best regards,
Hello @Martynas
Sorry for this hassle.
Hello
I finally managed to update the internal modem firmware.
Here are the steps that I used to update TRB500 internal modem firmware:
I don’t take any responsibility if something goes wrong!!
opkg update
opkg install modem_updater
modem_updater -g # you should see you current firmware and available versions
modem_updater -v <version>
But there’s one strange thing about the version numbers. The internal modem firmware version available in modem_updater is RG501QEUAAR12A11M4G_04.200.04.200, but after the update, the new firmware version is RG501QEUAAR12A11M4G_04.200.00.000.
I think the update was applied (previously R12A08, now R12A11), but the end of the version number didn’t change. Here are some screenshots from the webui and cli.
Does anyone know a solution for this?
I’m also experiencing issues with download speed when changing the WAN mode.
For some reason, the download speed is very good when the WAN interface mode is set to NAT, but when I switch to bridge mode, the download speed drops below 200 Mbps. In both cases, CPU usage reaches 100% during the download test.
I noticed that others in this forum have reported the same issue:
Do other Teltonika models have this issue, or is it only the TRB500? From what I’ve read on the Teltonika Community forum, some users seem to be experiencing the same problems with the TRB500.
@TeWe Do you have experience with the RUTX50? Does it have the same download speed issue when using bridge mode? It also seems to have a more powerful CPU than the TRB500, maybe it could help?
Sorry but we’re not using bridge mode so I can’t contribute here 
TRB500 modem issues - battled with it for months, never got Elisa nor DNA connections stable.
Had enough and changed to RUTC50 with different modem (RG520).
Good luck. 
Okay, then I’ll have to change the device as well. I don’t have time to figure out all the problems. 
@niko.virta Where did you find information about the different modem? I couldn’t find any mention of the internal modem model in the datasheet.
Teltonika hides what modem is in what model for some unknown reason, but you have to dig deeper.
Teltonika uses Quectel modems, TRB500 has RG501Q (first 6 letters in modem firmware tells you the model), more here about RG501Q: https://www.quectel.com/content/uploads/2024/03/Quectel_RG50xQ_Series_5G_Specification_V1.71.pdf?wpId=114138
RUTC50 has RG520N, https://www.quectel.com/content/uploads/2024/03/Quectel_RG520N_Series_5G_Specification_V1.6-1.pdf?wpId=114153
Figured this out when investigating 5Ghoul vulnerability: https://teltonika-networks.com/newsroom/vulnerability-fix-to-5ghoul-affecting-teltonika-5g-devices - here you can find also what modems are in RUTM50/X50 and TRM500.
Hello @niko.virta
I bought two RUTC50 and those are working much better than TRB500. CPU loads are looking normal and GSM speed are so much better now. No problems with wan bridge mode.
But there is one possible problem that you should also be aware of. There have been some possible issues with RUTC50 temperatures and those might come problems under heavy loads. Here is link for the thread that have mentions about heat problems.
Good evening @Martynas
I have now reported the issues with the TRB500 modem. Will there be any fixes from Teltonika’s side? I am quite sure they are already aware of these problems.
I still have one TRB500 device and would be happy to use it, but it seems impossible due to these issues.
Can Teltonika provide a refund or fix the firmware problems with the TRB500?
Regards Reissumies
Hello,
Could you provide some additional information regarding the issue you’re facing with the TRB500?
Additionally, if you prefer, to investigate your issue more in-depth, I’ve sent you a form to fill out. Please use 12172 as the ticket ID. Once submitted, we’ll contact you privately to troubleshoot the issue further.
Best regards,
