I am also having the same problem as others have posted. I have a Yi 1080P Home Camera, Model YYS.2016. There are no problems with my WiFi and I have 1 other yi home 1080p camera which is working correct on the same WiFi.
I’ve reset the camera using the hidden button on the back and the camera says: Reset successfull. After that the camera reboots and start saying “Welcome to Yi Home Camera. Waiting to connect!” and starts flashing yellow light. I then start the Yi Home App on my Android device, scan the QR Code on the back of the camera, setup the WiFi (2,4 GHz) data in the App, scan the QR code with camera from the smartphone screen, camera says “QR-Code scanned is successfull” and the light starts flashing blue for a short time. After that the light becomes yellow and the camera reboots and the camera start saying “Welcome to Yi Home Camera! Waiting to connect”
I tried it many times and moved closer to the router/modem and restarted that also. I can’t connect the camera to WiFi anymore.
I checked my Version also and it is 5.5.6 – Any advice or help would be greatly appreciated.