Following these steps will lead to the same issue that i faced, Google contacts sync will not work, in addition to process errors that u will face. I posted the solution to this problem in the Mi forum and i will post it here as well ...
** FIX FOR Mi5 USERS WHO EXPERIENCED ISSUE WITH GOOGLE CONTACTS SYNC **
The version of Google Contacts Sync app that comes with the one touch Google Installer V2 app WILL NOT WORK with Mi5. This is because the older version of Google Contacts Sync app is not compatible with Marshmallow. You can download the updated version of the Google Contacts Sync app here:
http://www.apkmirror.com/apk/google...gle-contacts-sync-6-0-1-android-apk-download/
Follow these steps:
1) If there is an older version of Google Contacts Sync installed, uninstall it first.
2) Install the downloaded copy from the above link.
3) Go to Apps Permission and allow it to access your contacts.
4) Reboot phone
5) Go to Google Accounts in Settings and make sure contact sync is turned on.
6) U should have your contacts synced without facing any more process errors.
download the Google Installer APK and load it to Mi 5, follow the steps thereafter
Sent from my Rice phone using GAGT