Answer of your leaving message
I have no upgrade my firmware since 2016, I notice my firmware is 3.7.8, and the latest is V4.3.2.

I try to login the app and go to the Setting tap on IOS, it never prompt me about the new firmware I should upgrade!!

So what I can do now to upgrade the firmware?

by Aric

Dear Aric, thank you for contacting.
If you go to App->About->Latest firmware version, click, if still no prompt showing up, suggest not to try it anymore because it might mean the camera starts to be abnormal (internal component) and may have trouble during the updating likely. Thank you