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The phone has some bugs in this new update I have tried doing a factory reset but it still has the android 8.

marked as duplicate by Dan Hulme Jul 13 '18 at 8:37

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  • A factory reset never reverts system updates. Take a look at our factory-reset tag-wiki for details. So as Gastón wrote, you'll need to download and flash an Android-7 ROM that was build for your device if you want to downgrade. – Izzy Jul 6 '18 at 7:00
  • Also is it possible that with this new update can cause sound issues with the receiver since I am not hearing anything when someone calls me. I have run the android diagnostic to check to see if the receiver is working and it failed that test. If I revert back to Android 7 might it fix this issue. – user7112108 Jul 6 '18 at 10:09

It applies the same concept as this video https://www.youtube.com/watch?v=06rlFAwGJYM

you will need to download the ROM of android 7 and flash the device

its an easy process that take less than 5 minutes

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