@Zahackn With your smart phone connected to the hotel wifi, what is the IP and gateway obtained by your phone? Meanwhile, you can try to configure the 902AC as a repeater to give it a go. Please...

@LaBa It is the Channel avoidance mechanism which causes this issue. Cause the LTE/3/4G uses the same wifi channel as the TP-Link wifi, to avoid conflict between each other, the wifi channel will...

@QuinnHUN Thanks for your reply; cause the HDD connects to the router via an external HDD case, to narrow down the issue, it is suggested to connect a HDD to the USB port of the C1200 directly and...

@desp Thanks for your reply. The link attached in my last reply is the firmware for MR6400 V1, the current one is the latest firmware, you can download the older one and install it to give it a go....

@Sanjayd The Archer C1200 can block websites only, but it cannot block APPs. FYI, there are some devices can block both websites and APPs, like Deco M9 plus and Deco M5.

@Exie Hello, the API info is not available for end-users. Wish your kindly understanding.