Cannot unlock bootloader (Connect to the network and try again)

[Valwex]

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Hello, I'm calling on you after trying everything to unlock the bootloader on my Redmi 3 (Android 5).

I'm stuck at the stage where I have to associate my account with my device.
My Mi account is already added to the phone but I can't click on the button in Mi Unlock Status.

Here's a list of everything I've tried:​

- Use a VPN (Singapore, China, USA, etc.)
- Create a Mi account with a VPN by changing the phone's region
- Factory reset (done several times)
- Empty the cache of the "Update" application
- Attempt to unlock bootloader with Mi Unlock (impossible, asks me to connect my account to my app)
- Insert SIM card
- Disconnect mobile data, Wi-Fi, reconnect both...

I've already searched everywhere on Google and even testing the solutions doesn't work... Most of the topics are never solved or the proposed solutions don't work for me.