[help] Update to High Sierra via USB

I have Yosemite on my PC, but it won't boot because I upgraded to a GTX 1080 a while ago. I know that High Sierra should support my card if I install the necessary drivers.

My question is: How do I update to High Sierra without formatting my HDD? As I said, I cannot boot, is it possible to update via USB or would it be easier to just uninstall my graphics card, update normally and then reinstall it?

Any suggestions would be greatly appreciated!

submitted by /u/neotil1
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