FT800 support only WiFi of 2.4 GHz frenquency, you may need to change your router settings. Refer to this: https://www.youtube.com/watch?v=Iw4bwEVDUkg

1. Search for "Hereprint" on App Store or Google Play and install

2. Make sure your phone is connected to WiFi of 2.4 GHz frquency. Tap "Connect printer"

3. Tap "Connect"

4. Enter WiFi password, then tap "Setup WiFi", wait till connected.

5. Tap "Pictures", "Documents" as needed.

6. Tap print icon on the right top corner.

7. Tap print icon on the right top corner.

8. Tap left lower corner to set "Darkness", "Copies", "Print size", "Printing mode", then tap "Print"