This model is no longer being produced. The replacement model will come with 6.0. It is possible to update android 5.1 to 6.0, but there will be data loss. Here is a link to an article about this upgrade:
http://www.easeus.com/android-data-recovery/upgrade-android-os-from-lollipop-to-6.0-marshmallow.html
8 years, 6 months ago
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Lenovo Product Expert