Hello  @Ale.Agos 

Thank you for the detailed post, wish I could help!

At first, please ensure the Ethernet cables goes into camera still have internet. You could connect Ethernet cable - PC and ensure that cable still have internet

Factory reset camera and reinstall it, when set it up in Tapo APP, please select ' Etehrnet( Wire) ' instead of 'WiFi ', make sure phone connected to home wifi network,  could the app find the camera? 

• How to reset my Tapo camera

Do you own 2 tapo C310, do they encounter the same issue? If there is any Error when set up the camera, feel free to let us know. 

 Hello  @Ale.Agos 

The deep reset is the to use a pin to push the reset hole as guide How to reset my Tapo camera

If Ethernet set up failed, to check if there is any faulty with Ethernet cable with camera, we need to know at which step the set-up failed

1)  Could the camera be found by Tapo APP through 'Ethernet (Wired' connection)

You could log in router to check if camera shows up in router client list device. 

2) Check if there is advanced settings on router like MAC filtering, Access control etc.

3) Try swap a different Ethernet cable between router and camera.

If a PC/ laptop connect to the same Ethernet cable from router, could it get internet and IP address.