Problem connecting to smartphone

Good afternoon everyone ! My name is Thiago, I’m Brazilian and I’m with Kw88 soon.
I need a help, I do not understand anything about smartwatch, I have problem to connect my smartphone Xiaomi Mi 8 Lite with Smartwatch, for the WiiWatch app as soon as my smartphone finds the smartwatch and connects, after a few seconds it disconnects, I can not pair so I can receive notifications from WhatsApp, for example
Anyone know if this may be upgrade problem or would it be smartwatch hardware? if there is any way to update please explain to me how to do it because I do not understand it very well
The Wi-Fi connects but right next to the router gets less than half the signal, is it normal?
Thanks for the help!