How do I configure the wireless mode (802.11) on my router?

Please launch your browser and enter http://dlinkrouter.local or into the address bar. Then login and follow the steps below:
Step 1: Click Settings -> Wireless

DIR-878 Setup

Step 2: Disable Smart Connect, and select the 802.11 mode for 2.4G/5G band:

Step 3: Click Save to save your configuration.

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