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Failed Lenovo Tab 2A7 10F UPDATE

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I installed my system update.  After some time, it showed "update failed" after that, it rebooted. Later it sshows a black screen on which there are two messages. 1:Unfortunately System UI has failed. 2:Unfortunately com media ten.voice extension has stopped. 

The above two messages are shown alternatively. If I click "OK", the other message appears. 

I can neither switch off nor reboot my device. 


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Little late in replying....


Allow the battery to drain completley so it won't turn back on.

Charge it 100% without switching it on.

Boot into recovery menu >  clear all caches and do a factory reset.


* You will loose any locally stored files doing this.

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