1. Download the File I have attached, then unzip using 7-Zip or WinRaR:
2. Connect Mi 6 to PC then paste the unziped folder (Tested Gapp for CN folder) under MIUI\backup\AllBackup\
3. Go to Settings\Additional Settings\ Local Backups\
4. Select the Dec 12 2016 File then Click RESTORE.
5. Reboot your Xiaomi Mi 6
6. Enter your Google Play Username and Password.
7. Try downloading some apps to test if it's working.
Congratulations, you can use google apps now.
If stuck in checking info, Connect Mi 6 to PC then paste the unziped folder (Tested Gapp for CN 2 folder) and then install -
1.Google Play Store-7.1.11.I-all [0] [PR] 135312875,
2. com.google.android.gms_11.3.02_(448-161239932)-11302448_minAPI23(arm64-v8a,armeabi-v7a)(480dpi).
Retry from no. 6&7 it.
Download:
Tested Gapp for CN: https://drive.google.com/open?id=0BypOm9eqYE9oYWFzcnIzUTUtSU0
Tested Gapp for CN 2: https://drive.google.com/open?id=0BypOm9eqYE9oNExIcWdUS1Vmdk0