Here’s a solution on how you can make WiFi 40Mhz 2.4GHz speed on your Xiaomi Mi6 phone. You’ll need root and file manager application on your phone.

Xiaomi Mi 6 Solution – Set up Wi-fi 40Mhz for 2.4GHz

  1. Using file manager go to “/system/etc/wifi”
  2. Open “WCNSS_qcom_cfg.ini” file with text editor.
  3. Search for these lines:
    #Channel Bonding
    gChannelBondingMode5GHz=1
  4. Now add this line “gChannelBondingMode24GHz=1”, so it will look like these:
    #Channel Bonding
    gChannelBondingMode5GHz=1
    gChannelBondingMode24GHz=1
  5. Save & reboot.
  6. Now WiFi speed should be 144 Mbps instead of 72 Mpbs.