After logging in to the router admin, go to “Network > Wireless”. Click the “Edit” button on the 2nd row of Master SSID.
Country Code
Click the tab “Advanced Settings”. Choose USA or Australia on the option of “Country Code”. Save & apply the new settings.
Transmit Power
Click the tab “General Settings”. Click the option of “Transmit Power”. Scroll down and choose the last one 30dBm (1000mW). Save & apply the new settings.