liuhao
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ok i removed tgsp. 
after i remove i realize the tgsp has certain color...it's kinda yellowish/grayish. the light passing through could be 80% only. maybe that's the reason fp doesnt work all the time. however, optically, i dont observe any distortions if i look through it.
edit: i realized touch sensitivity has greatly improved too, without tgsp. also the display quality improved also. for some time i feel my eyes hard to focus on small fonts. i thought was due to my new spectacle but now problem disappeared.
after i remove i realize the tgsp has certain color...it's kinda yellowish/grayish. the light passing through could be 80% only. maybe that's the reason fp doesnt work all the time. however, optically, i dont observe any distortions if i look through it.
edit: i realized touch sensitivity has greatly improved too, without tgsp. also the display quality improved also. for some time i feel my eyes hard to focus on small fonts. i thought was due to my new spectacle but now problem disappeared.
suddenly got an urge to remove the glass screen protector. anyone is like me? mine is nicely pasted but the added weight, ugly edges, hit-and-miss fp scan DO bother me...
i understand its grorilla 5 which has mohs hardness about 6. the quartz particles in beach sands and dusts would have hardness of 7. i guess i will need to stay away from that.
another motivation is seems the price of mate 20p is dropping..that makes it less precious...
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