Finally, resolved this problem by reinstalling Security Update 2019-003. It seems updating iTunes and installing iTunes device support will update preboot volume and so does this security update.
Now the graphics card's working well with webdriver on.
I installed this updated webdriver successfully, however, when i reboot with GTX 750 Ti connected by a DVI socket, the screen got black prompting no signal after running through the codes. I never experienced such issue on 10.13 through 10.13.4. I tried with a VGA socket and the problem...
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