Hello! I would like to ask for help!

I bought Y2 Plus braclet gearbet.com, but I can not connect to the app because it provides device has been frets. What can you do then? I tried the iPhone 7 Plus, Samsung Galaxy Tab S2, but one of them does not work because it is already registered to another account!

Thus, the product is useless, yet I can not set the clock shows the time in China!