@S1687 

For MR6400 V4(the same as MR600 v1 or other models in beta firmware), the beta firmware provided the option to manually select the 3G/4G bands which the modem supported theoretically(all the listed bands), but not all the bands could be actually detected by the modem in the real network scenarios, which might be the first possibility.

(For the MR600 V2, it is a little different and all the listed bands could be in use.)

So in your case, it is quite like this one.

Then the second possibility, for the B41, for the EU version of MR6400, the bandwidth is between 2555-2655MHz and it has been reported that some SIM carriers use B41 from 2555-2655MHz to 2496-2690MHz. So we might need your help to check whether the Vodafone SIM is 2555-2655MHZ or 2555-2655 to 2496-2690MHz.

TP-Link wrote

@S1687 

For MR6400 V4(the same as MR600 v1 or other models in beta firmware), the beta firmware provided the option to manually select the 3G/4G bands which the modem supported theoretically(all the listed bands), but not all the bands could be actually detected by the modem in the real network scenarios, which might be the first possibility.

(For the MR600 V2, it is a little different and all the listed bands could be in use.)

So in your case, it is quite like this one.

 

Then the second possibility, for the B41, for the EU version of MR6400, the bandwidth is between 2555-2655MHz and it has been reported that some SIM carriers use B41 from 2555-2655MHz to 2496-2690MHz. So we might need your help to check whether the Vodafone SIM is 2555-2655MHZ or 2555-2655 to 2496-2690MHz.

@rakrisi nice to see you again and Could you please check the exact bandwidth for B41 at your state in India?

  @Namann1 

Hi, can you forward the email to me?—I have provided my email address to me via private message.

In my option, I do think B41 has a quite wide range of bandwidth, for example, 2496 to 2690mhz, and our 4G router supports part of it which is 2555-2655mhz.

And based on the user feedback before, different states in India also have a slight difference about the exact bandwidth of “2500mhz”, such as from 2535-2545mhz in Kerala/India.

Thank you very much.

  @Namann1 

Hi, thank you very much for the detailed information.

I see the network mode is "4G only" and would changing to "4G preferred" make any difference?

By the way, I did not see your current firmware version on the official websites, and may I know where did you get this firmware?

At the same time, I would like to forward your case to the senior engineers, and please check whether you could get an email from me.

Thank you very much.

  @Namann1 @S1687 

Hi, nice to see you again.

I thought I forgot something and here it is.

The bandwidth of band 41 is limited by the hardware and different regions might have their own supported bandwidth of B41. So software upgrade is unable to fix this issue.

A customized model based on the region will be the proper solution. Normally the local office needs a certain number of user feedback to initialize a new product.

In this way, sending feedback directly to the local support team will be highly appreciated.

Thank you very much.