no 4g signal for TL-MR6400
hi, I hold a 4g modem TP LINK model TL-MR6400, for more than one year I used it with different SIM cards and worked perfectly. All of a sudden the modem stopped working. it doesn't pick 3g or 4g signal; no upgrade/change in config was made prior the issue. The WIFI works fine and the SIM card too (tried it on different modem...). I tried both firmware upgrade, ISP upgrade and then fabric reset. None of theese worked, while i test network it says:
Test Sim Card Pass
Test WAN Connection Fail
Diagnostics completed
Note:Internet unavailable due to no 3G or 4G signal. Please position the antennas upward and place the router in a location where it can get a good 3G or 4G signal reception.
what can I do ?? the device is now useless ? it's a shame as it wasn't hit or didn't experience overloads..
thanks for the support ))