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THE BIG PROBLEM - There are many guides on how to install TWRP, Magisk, and Root this phone. They are ALL HORRIBLE. None are complete, each having different problems including procedural errors, missing steps, and things that just completely do not work. By the time I successfully rooted this phone I could not remember exactly what steps I took and how I finally successfully completed the process. Therefore, the guide below is not clear and step by step. It will be improved in the future when I get the opportunity to root additional Pixel phones. * choose advanced -> fix recovery bootloopNow back to the android desktop so we are out of the bootloop. Press the Square and choose Magisk Manager. It still indicates Magisk is not installed.''Note: This device is using the A/B partition. There was no warns about installing TWRP when the phone has A/B partition in any of the guides I started with, but apparently it is not a good idea to install TWRP when the phone is the version with A/B partition. Too late now! moving on...''Attempting to install Magisk from zip using Recovery TWRP again. Difference in procedure. This time I downloaded the latest zip on the PC and transferred it to the phone via data cable rather than downloading from the Magisk Manager app. Result - phone slow too boot then stuck in bootloop again. Had to advanced, fix recovery bootloop again in TWRP.