Best answer by JackJ
Sorry to hear of the situation of your device and thank you for providing us with all of the troubleshooting steps you have attempted.
In this case I would recommend having the device inspected by one of our engineers at the service center for a more hands-on approach.
For the UK region you can arrange the service booking via mail chat or hotline (at 08000886700 free of charge of course) via https://consumer.huawei.com/uk/support/
Or if you would like I can also facilitate this for you via PM.
Hope you found this helpful.