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No mobile network connection on RUT240

Firmware version RUT2XX_R_00.01.14.3
Firmware build date 2021-08-18, 06:51:52
Kernel version 3.18.44
Bootloader version 2.0.1

Status/Overview shows page with blank fields (no any status data)

Also I cannot download troubleshoot file, cannot view mobile status tab. Internet via cable works, DHCP works.
Tell me please what can I do for fix or diagnose problem.

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Hi,

I would like to recommend reflashing your firmware via the bootloader menu. Please follow these instructions: https://wiki.teltonika-networks.com/view/RUT240_Firmware_Downloads

Regards.

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I reflash it several times. At first time with saving settings, and then without. Also device cant connect to update server while checking update. Maybe I try to some downgrade firmware, but I think it do not help - as I remember latest firmware works about two weeks.
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As I expected - downgrade to 1.14.1 do not help. Same situation.

P.S. But now I see many errors in log:

Tue Sep 28 16:08:58 2021 daemon.notice netifd: ppp (2101): error: couldn't create client for the 'nas' service: CID allocation failed in the CTL client: Transaction timed out

P.P.S Actually downgrade helps a little bit. Firmware are slow in refreshing system info, but I see that it work. Now I am trying to restore mobile settings and hopes it will be work again.