Mi band 2 - pair problem [ solution ]

Works to me, when i uninstall the app "Mi fit" and after "Mi band control". 
Now, enter in you apps configuration, unpair and clear bluetooth cache. 
Restart the phone.
Install "Mi fit" again.
Log in, and pair the mi band 2 with your device!

Enjoy!
Vinícius Feitosa da Silva

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or

http://en.miui.com/thread-98842-1-1.html

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or

Unpair Mi Band 2 first
Then un install Mi Fit App
Then restart ur phone
Install Mi Fit app(see bellow link)
Then try to pair Mi Band 2(dont cancel pair)(try again and again)
it will work
Note -  please dont pair or operate when charging ur mi band 2

For more faq's please find below link;
Mi Band 2 FAQ: Specs, Price, Look, Package, Usage, App & More  (Updating)
http://en.miui.com/thread-324471-1-1.html
(Source: Xiaomi MIUI Official Forum)

or try this

Hello, i bought my mi band 2 a few weeks ago and I was able to connect it before no problem (Android 4.4)
Since i changed to Android 6.0.1 i had a lot of problems, and this is SOME of the methods i tried to fix it with... hopefully some may work for you:
* Reboot phone, reboot bluetooth, reboot GPS;
* Delete mi fit cache, reinstall mi fit, delete bluetooth cache;
* Connect band to bluetooth and then to the mi fit app (this actually worked... until today's update);
* Forget bluetooth connection with the band;
* DON'T connect to bluetooth first, just go straight to the app (this method worked fine for my Android 4.4);
* Do all this with band connected to the PC and charging;
* Also do all this WITHOUT the band connected to the PC;

Thanks to @arturjnt

Also try this sollution.
http://en.miui.com/thread-172180-1-1.html