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I have Lenovo A6000 plus. Still running on 4.4.4
I tried update my OS via Lenovo update as I haven't done it a long time and Lollipop is there
Download seems fine, and it changed into recovery mode to update.
Then I get a error saying"your phone has not switched carrier and cannot upgrade" and the installation gets aborted.
Some site says I need to install some ota file.Is there any easy way to solve this?

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