Hello.Try To Update MIUI 9.2.1 (or) Try With Mobile Data and Install Google Services For Redmi note 5a.Permission Fully Allow On All Google Services app

Google Services apk Link For Minote5a

Good Luck Fri"
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http://google-play-services.apk.cafe/xiaomi/redmi-note-5a

http://google.apk.cafe/xiaomi/redmi-note-5a#gallery-1