I use this method for the mate X2 and mate40 RS as they all both using Kirin 9000.
They are different ways to work on mate Xs ,mate 30 series and the P40 series(Kirin 990)
Currently this method only work for those with firmware for China market
Try factory reset ,I do have a mate 30 Porsche too and I had it side loaded with GMS last year with just lzplay.i did a factory reset as I was passing the phone to my son so I use John Wang method since its emui 11.works fine
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Actually all method will not work after certain time as Google will try to block it ,as for now https://youtu.be/ivpNP7wFE9I this is the latest method that work as on 1st of April.
Until Google block it again
I use a combination of both method to get it working on the mate Xs ,mate30 RS Porsche designs and also the notepad pro 5g
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I have a fd from singapore,after using for six days it froze on the 5th and 6th night so i tried not using the blue light filter and auto update software ,so far its running good for 3 days without any problem,keeping my finger cross