Unable to activate the wifi on JPT3818W HD

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Device model JPT3815W-HD
Hard version V1.0.0.1
Software version V13.1.1.1.4
Web UI version V13.1.1.4



Hello,
I buy 3 ip camera JPT3815W HD and that makes two days that I try to connect to wifi.
As soon as I remove the Ethernet cable the camera is no longer detected.
What is the procedure for activating the wifi ???