Xiaomi Mi Band Smart Wristband Bracelet Fitness Wearable Tracker Waterproof n/a Imported Requires Bluetooth 4 Compatible with Mi 4 Mi 3 Redmi Note 4G or any device with Android 4 point 4 and above Compatible with iPhone models 4s and above that run on iOS 70 and above Note Mi Bands phone unlocking feature requires smartphones with MIUI or Android 50 and above For Issues related to charging the device Pull the Mi sensor device out of the bracelet band Now clean the device from all the sides Also clean the two connector pins properly to remove any dust or any residue on the surface of the connector pins Now try charging it it should work For pairing issues follow the steps Open Mi Fit Go to Settings Tap Mi Band signed in It will show no band error Scroll down and tap Unpair OK Close Mi Fit app and restart it Now you will be asked to pair your Mi Band again Simply tap on the Mi Band when the LEDs start blinking and it will be synced to MiFit app on your android All of your data prior to the error will now show up and the Mi Band will start tracking your steps calories sleep etc like normal