@KasaX Hi, May I know who is your SIM card carrier? What is the Network type of the SIM card? For MR600, the network type would be： 4G: FDD-LTE: B1/B3/B5/B7/B8/B20/B28 (2100/1800/850/2600/900/800/700...

@sdsds Hi, please hold on for a moment and let me confirm with the senior engineers. Thank you.

@Diana1313 Hi, I am afraid that you need to provide more details like model number otherwise other users did not know how to provide assistance. Thanks.

@Marshall_mhr2 Hi, How long have you had the modem? I think it might need to be replaced.

@gazzasma Thanks for the correction. Then we might have one more issue waiting for the assistance of the engineers.

@Mizuka Hi, some models are customized for the local service providers so their firmware is not like the generic one released on the official websites. I am afraid Archer VR1200 would be one of them....