TRB501 unusable, modem crashes

Networking Solutions
1

I’m having major problems with my TRB501.

System FIrmware: TRB501_R_00.07.20
Kernel version: 5.4.197-perf
Modem Firmware: RG520NEBDCR03A01M4G

Problem 1:
The modem crashes after a few minutes, as described in many other forum posts.

Problem 2:
I don’t know if this is related to Problem 1. I have about 15 devices connected to the TRB501. Some devices randomly lose internet access. In the browser, I get the error message “ERR_TIMED_OUT”. Other devices work perfectly. The next day, the other devices stop working again and display the same error. After restarting the modem, the error is temporarily resolved. In Wireshark I see a lot of TCP retransmissions.

Problem/Question 3:
Why is the RAM capacity only listed as 177 MB? According to the specifications, the TRB501 has 512 MB of RAM. Furthermore, the occupancy rate is consistently around 80%. Is this normal behavior?

image
image905×174 8.89 KB

Unfortunately, the device is unusable for me in this state. I therefore request prompt assistance. I already sent a troubleshooting file via email on December 17, 2025, under reference “#16039-2”.

2

Greetings,

Thank you for your message,

I have sent you an email with additional information regarding the modem update, we can continue communicating through the ticket. Additional questions will be addressed in the ticket as well.

Kind regards,
V.

4

I don’t have access to the ticket. Could you please create an account for me? Where can i find it?

5

Greetings,

Thank you for your message,

The ticket I was referring to is 16039-2.

Kind regards,
V.

6

I don’t have access to the helpdesk. Where can I find the ticket?

7

Hello,

Thank you for your message,

The communication regarding the ticket was done via email. Please check you inbox for more information.

Kind regards,
V.

8

Hello deganl

What was the solution for you on this case?

I have also low memory shown (177MB instead of 512MB) but no modem crashes.

Additionaly: the download speed in bridge mode is reduced to 200 Mbit/s. Modem Update from A01 → A05 gets an unexpected error (I am in contact with Teltonika Support regarding this).

Thanks for your help

Regards

Frank

9

Hello, @Avocado,

Thank you for your message.

I have forwarded your question to our R&D team and will inform you as soon as I receive further information from them.

Regarding the crashes, the issue is still under investigation as we are working to identify the root cause. I will provide an update on this matter as soon as we have more clarity or a solution available.

Thank you for your patience and understanding.

Warm regards,
V.

10

Hello Vilius

Thanks for your message.

As I wrote, no modem crashes so far.

But if the RAM ist really 177MB instead of 512MB I need a replacement anyway. What is the status in this fault?

Just for your information; I am also in touch with Julius J. regarding the speed problem / Modem Update problem / low RAM problem…

Regards Frank

11

Greetings,

Thank you for your message,

Our R&D team is still investigating the case. I will provide you with an update as soon as I receive more information from them.

Additionally, you can follow this topic, we will update it once we have more information from R&D:

Your patience and understanding are greatly appreciated.

Kind regards,
V.