After 07-17, the process is much simpler.
Start with a Flashall at this point.
Reboot, confirm you're on at least 27.1.2
Go to bootloader, boot TWRP 3.2.2 image.
Then follow the steps given by npjohnson(https://forum.xda-developers.com/z2...
What's really interesting is the guy he is yelling at didn't even quote his posts, and the only post by him in the past five pages comes after the guy he's yelling at.. Wut
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And this is when we ...