@Vishlamba yes you can downgrade from controller. there is usually no problem. have you extracted the zip file before trying to install new firmware?

@Vishlamba ok it looks like there is something buggy with the version you have. try and downgrade to 1.1.4 and then you can upgrade to 1.3.0 beta....

@Vishlamba what is your current firmware?

@Vishlamba Try this version https://community.tp-link.com/en/business/forum/topic/855714?moduleId=1

@icysummer What have you set Block TCP Scan with RST to, it is off by default, if you enable it you will get an failed when scanning

@icysummer You can try a roule like this to block all to managment interface. then you also need to know that you are blocking other services on the router such as openvpn, this is not possible and...