@kreso 

Good day.

Thank you very much for your time and patience.

Have you ever tested the Huawei E3372 on the USB port of the computer to see if it is working correctly on the laptop?

And have you tried to take out the sim card and put it again to see if the error message still here?

If possible, please also hold the reset pinhole on the router for 10s to do a factory reset;

 Thanks a lot.

Hi,

yes, usb dongle works, I already wrote:

"USB connection works when connected to PC directly"

(I'm connected with that USB to internet)

No, pinhole doesn't work never detects sim.

What other can I do?

@kreso Hi, just in case, make sure you have a E3372h. The 'h' means the 'hilink' version, which is the one I see marked as compatible in the link you posted. Non 'h' modems use different connection modes and may be not compatible unless specified. Hope this helps.

thx @FTC 

yes it most definitely is - I have:

Device name — E3372h-320

Configuration file version — E3372h-320-CUST 10.0.3.1(C965)

I can give you my serial number, IMEI, IMSI and bunch of other tech details if that helps..

Does anyone know who programs firmwares for this devices so I can contact them directly to see what firmware do I need or why my device is no go..

MY TL-MR3420 V5 CAN NOT SUPPORT E3372h-608 also