whiteman808 I want to do a full backup of stock ROM before I flash Graphene OS in case something wrong went with Graphene OS or I needed to give phone for guarantee.
userofgos whiteman808 I want to do a full backup of stock ROM This is not necessary as you can just visit Google's Android web flashing tool as Lion eluded to, after removing the non-stock AVB key: https://flash.android.com/back-to-public
Lion Please have a look at the official documentation website and use the search function in this forum before adding yet another duplicate topic. Start by having a look here: https://grapheneos.org/install/web#replacing-grapheneos-with-the-stock-os