@l.rs Which beta firmware do you want to upgrade to? We suggest you use the beta firmware provided by TP-Link official or tech support if you do need to, thanks.

@Satheskumar We would follow up your case on another post, thanks.

@_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?