Thread is outdated, a new tool was built:
forum.xda-developers.com
BOOTMOD - Root your Shield In 1 minute (2015, 2017, & 2019)
Hello Friends~! We now have a working method to achieve ROOT on STOCK Firmware! A script has been made that can boot your shield into the bootloader, erase the old boot, flash the new boot, and install your choice of Magisk apk for you. The...
forum.xda-developers.com
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