Today, I share with us "how to install GApps for Xiaomi Mi6". The first, please download this file: https://drive.google.com/file/d/0Bw4gYGZcShtVLW5ET0Ytb2FEYWM/view?usp=sharing

Installation steps:
1. Extracting the zip files will create a GApps-Mi6-MiPad3 folder (If you downloaded from PC/Laptop, copy extracted folder to your internal storage)

2. You need to go inside that folder and move the AllDirectory folder into Internal storage\MIUI\backup (If there is no that folder, you can create it)

3. Now open Settings/Additional settings -> Backup & reset -> Local backups

4. You will see the backup folder that you have put in the backup folder, tap it -> Restore then wait till Finish

5. Restart your device, open Play Store app and wait a second for checking info. Login with your Google account, now you cn use Play Store on your device.

A temporary solution for fixing Play Store 'Waiting for WiFi..." problem
1. Follow the above method. Restart your phone

2. Go to Settings/Installed apps/Google Play Store -> Uninstall.

3. Download this Google Play Store version: Google Play Store-7.1.11
(this version is disabled automatically updated version, will not force the upgrade store version).

4. Restart your phone again.