I bought MR600 few weeks ago.

I'm using Airtel simcard which supports 4g+.

I also installed beta firmware to manually select frequency bands(in my case band 3, 40).

When I hit save it connects to 4g+ and speed was amazing.

After some period of time, it automatically switches back to 4g(in my case it switches back to band 40 only).

When I check the band selection it still on band 3, 40.

Now I need to set both band to 3 and then change one band again to 40 in order to get 4g+.

I did checked my signal strength it was really good.

I don't know why it automatically switches back to 4g even 4g+ available.

Expecting a quick support