@Puth Good day. Thank you very much for your time and patience. Later I would send you a beta firmware which would allow automatic band selection and you could have a look; Thanks a lot.

@Rogpop Good day. Thank you very much for your time and patience. May I know where are you located? And it would be much better for you to contact the local support team to see if they have any stock...

@Ed2001 Good day, Thank you very much for your time and patience. Sorry for the delay. Did you mean after the firmware upgrade, the Battery percentage disappeared from the tpMIFI APP or the LED...

@PH1UK Good Day, Thank you very much for your time and patience. For your case, you could refer to the following suggestions to see if helpful or not; Change the wireless channel on the 2.4ghz， like...

@AravindS Good day. Thank you very much for your time and patience. We have a beta firmware which could fix the unstable connection caused by the randomly band switching. Later I would send to you...

@Cavedude Good day, Thank you very much for your time and patience. Sorry for the delay. May I know the hardware and firmware version of the TL-MR6400? And I am not quite sure what the exact issue...