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Unlock the bootloader (fastboot oem unlock, confirm on the Shield), flash the NVIDIA stock/developer recovery images, boot TWRP and flash Magisk; on 8.x you need resetprop ro.boot.verifiedbootstate after each reboot. LineageOS (mdarcy) is the custom-ROM route.
Follow the specialist sources linked on this page. If this path is a jailbreak, unlock, or flash, the specialist wiki is the how-to — we do not copy those steps here.