Google just released their latest May security patch which did something a bit unexpected. It killed root on the Pixel and Pixel XL. If your phone was rooted with Chainfire's SuperSU then you lost root access after applying the update. Chainfire has explained why this happened and has also offered a solution to fix it. According to Chainfire root was lost because the new bootloader included in the May security patch doe not accept unsigned boot images. Root via SuperSU requires a flash to the bootloader. There is a fix for this. Google is using Android Verified Boot to verify image signature. Chainfire has given detailed steps on how to generate custom signed keys to re gain root access. Head to the official thread below for the full guide.
via XDA
