because our unit normally doesn't support update from android 7.1 to 8.0 or from 8.0 to 9.0 or even higher grade.
Usually we update the firmware just fixing some bugs and if you didn't suffer that bug ,we don't suggest you flash the firmware by yourself,because you might flash the wrong firmware and lead to the broken unit.
Hope your kind understandings.
RegardsStatistics: Posted by Jammy — Thu Aug 30, 2018 5:37 am
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