GL-X3000 + eSIM (Ubigi) – connects to network but no data / no IP

Router
1

Hi,

I'm using a GL.iNet GL-X3000 (RM520N modem) with an EIOTCLUB eSIM in slot 2.

The eSIM contains multiple profiles:

  • EIOTCLUB → was already on the esim when bought --> works perfectly (data + IP assigned)

  • Ubigi → was puchased separatly --> does NOT work

Problem

With the Ubigi profile:

  • Modem registers to network (Telekom DE, 5G NSA)

  • Signal and registration are fine

  • But:

    • no data connection

    • no IP address assigned

Settings used

  • APN: mbb

  • Authentication: none

  • PDP: IPv4

Logs (relevant)

requestSetupDataCall QMUXResult = 0x1, QMUXError = 0xe
call_end_reason_verbose = 210

After forcing IPv4:
udhcpc: sending discover
(repeats, no lease)

Final result:
Dial-up is failed using network configuration

Conclusion

Question

Has anyone successfully used Ubigi Profile in combination with an EIOTCLUB eSIM on GL-X3000 / RM520N?

Are there special APN rather then mbb which I have configured or modem settings required for Ubigi on routers (within Germany)?

Thanks!

3

Hi @fpe

Do you have other sim cards to test the cellular function?
Additionally, please export the modem-debug info from the INTERNET ->Cellular ->Modem Management to check the modem status.

4

Additionally, since I am not fully sure whether everything relevant is covered in the modem debug as it cannot be exported anymore when the Ubigi Profile is loading (seems the whole system is freezing) - I am also attaching some extra snippets captured with logread - modem on the OS level.

modem_log.bin (37.8 KB)

5

Hi Cathy,

thanks for your response.

Yes, I have tested with another SIM:

  • A Congstar SIM (Telekom network) in SIM Slot 1 works perfectly (data + IP).

  • This confirms that the cellular function of the router is working fine.

For SIM Slot 2 (eSIM):

  • The EIOTCLUB profile (pre-installed on the eSIM) works without any issues.

  • However, when switching to the Ubigi profile on the same eSIM, problems occur.

What I already did:

  • Changed APN according to Ubigi documentation from mobiledata → mbb

Result:

  • Network registration works

  • But no data connection / no IP is assigned

So in summary:

  • Same device, same modem

  • Same eSIM

  • EIOTCLUB profile → works

  • Ubigi profile → fails (data call / IP assignment)

I’ve attached the modem debug log for further analysis.

Thanks!

modem-debug.bin (5.6 KB)

6

@fpe It seems the sim card uses Telekom network. Please change APN to internet.telekom to see if it works.

If issue persists, can you share device to support to check?

7

Update for reference: This issue may be due to compatibility problems between the modem and the network frequency bands used by the Ubigi eSIM profile. Upgrading the modem can help resolve this issue.

8

After updating the firmware from RM520NGLAAR03A03M4G_01.201.01.201 to RM520NGLAAR03A04M4G_01.202.01.202 everything works as expected.
Thanks Cathy for your help!