GL-X750: sim card not registered after upgrade

mfi · September 10, 2024, 3:43pm

I unboxed a GL-X750C8 unit that I had sitting in a box for a while and set it up with a SIM card and it connected to the network on the first try.

Then I upgraded the firmware to the latest available 3.x version (3.217 as found here) and started seeing the message "sim card not registered" when the device tries to connect to the cellular network.

I also tried upgrading to v4 (4.3.19) with the same result.

In the logs I see cat: can't open '/tmp/modem.1-1/signal which seems significant.

Here is the full dump:

Tue Sep 10 16:42:42 2024 daemon.notice netifd: Interface 'modem_1_1_2' is setting up now
Tue Sep 10 16:42:43 2024 daemon.notice netifd: modem_1_1_2 (3088):
Tue Sep 10 16:42:43 2024 daemon.notice netifd: modem_1_1_2 (3088): AT+QNWPREFCFG="roam_pref",255
Tue Sep 10 16:42:43 2024 daemon.notice netifd: modem_1_1_2 (3088): ERROR
Tue Sep 10 16:42:43 2024 daemon.notice netifd: modem_1_1_2 (3088):
Tue Sep 10 16:42:43 2024 daemon.notice netifd: modem_1_1_2 (3088): AT+QCFG="roamservice",255
Tue Sep 10 16:42:43 2024 daemon.notice netifd: modem_1_1_2 (3088): OK
Tue Sep 10 16:42:44 2024 daemon.notice netifd: modem_1_1_2 (3088): Failed to parse message data
Tue Sep 10 16:42:45 2024 daemon.notice netifd: modem_1_1_2 (3088):
Tue Sep 10 16:42:45 2024 daemon.notice netifd: modem_1_1_2 (3088): AT+QNWPREFCFG="lte_band",1:2:3:4:5:7:8:12:13:14:17:18:19:20:25:26:28:29:30:32:34:38:39:40:41:42:43:46:48:66:71
Tue Sep 10 16:42:45 2024 daemon.notice netifd: modem_1_1_2 (3088): ERROR
Tue Sep 10 16:42:45 2024 daemon.notice netifd: modem_1_1_2 (3088):
Tue Sep 10 16:42:45 2024 daemon.notice netifd: modem_1_1_2 (3088): AT+QCFG="band",0,420000a7e2bb0f38df
Tue Sep 10 16:42:45 2024 daemon.notice netifd: modem_1_1_2 (3088): OK
Tue Sep 10 16:42:47 2024 daemon.notice netifd: modem_1_1_2 (3088): cat: can't open '/tmp/modem.1-1/signal': No such file or directory

Any ideas? I only have today and tomorrow left to set up the device.

ywp · September 11, 2024, 1:55am

Check whether the sim card works properly on the phone
Check whether the router antenna is normal
Check whether the APN of the SIM card is correct and try automatic dialing

mfi · September 11, 2024, 8:37am

@ywp Thanks for the reply!

The card works fine in another LTE router
Antenna looks ok — also the router was not moved after the firmware update, and everything worked before the update, so it's probably not a hardware issue
I did try entering the APN manually, but it didn't help

I also tried flashing back to the original version, but the UI is rejecting the firmware that I'm uploading. Would it be worth trying to flash using SSH?

ywp · September 11, 2024, 8:39am

Which firmware version you used before

mfi · September 11, 2024, 8:56am

I'm not exactly sure how it came out of the box, but I remember it was dated 2020. Possibly it was 3.102.

I don't see it on the downloads page, the earliest is 3.105.

ywp · September 11, 2024, 9:04am

Can I see it remotely?
Technical Support via GoodCloud.tar (192 KB)

mfi · September 13, 2024, 9:09am

I couldn't set you up with remote access this week because I didn't want to disrupt the internet connection in the house, but now that I'm back home I'll find a local SIM card and provide you access.

ywp · September 13, 2024, 9:22am

You can turn on the hotspot with your phone
The X750 will relay the phone's hotspot

mfi · September 24, 2024, 7:05pm

Sorry that took a while. I've set up GoodCloud. The document doesn't mention where I send the MAC address and password? The device name is 47013 (this thread ID).

ywp · September 25, 2024, 1:14am

Send me a private message

mfi · September 25, 2024, 6:58am

Unfortunately, that button seems to be missing for me