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I have the same problem with my Samsung Note9 with android 9. I've tried all of your formerly mentioned ways but the app still not see through the wifi the C5.
I was facing the same problems I tried many things but couldn’t get it I used your method also but it is not working. Then I came to know about this bestessays.com.au review site and they help me and now this problem is resolved at last thanks to this site.
Airplane mode worked, thanks. Phone is a Nokia 6.1 by the way.
I'm having issues with updating the firmware for the camera now. Any advice?
What phone do you have?
Turn your phone to airplane mode and enable the WiFi, to connect App to camera again.
If still does not work,
1. Forget the app.
2. reinstall App.
3. Download the last version of firmware and update.
See if that works.