@_azi_ Thank you very much for all the testing. Actually, what I assumed was that the issue you experienced might be the same as the others, and our developers had provided a beta to fix it, you can...

@Baenz Hi, the beta firmware version was provided prior to the latest official one, so this band selection is no included in the official yet.

@Dimitrije Thanks for the reply. We have reported the issue to the support engineers, they will likely reach out to you via email to continue to troubleshoot your issue.

@WhiteTiger Hello, can you find the option ICMP ping on the router's Advanced->Administration page?

@Satheskumar @Prasath_ragavan Hi, when did you encounter this error code 1? Which page? Are you still able to manage the router web interface at the moment? If you can no longer manage it, you may...

@Nuno_Pereira Did you install the below beta firmware on your MR600? https://community.tp-link.com/en/home/forum/topic/241534