Changing /system/build.prop issues on fully rooted and DM-verity removed device
See when you did the DM Verity patch, have you patched the boot.img to support Android 8.1? if working on Win can use ClassyKitchen. If working on Linux, AIK Linux is the way to go. i'd suggest using classykitchen and patch for DM verity and enable 8.1 support. worked for me. running 8.0 Oreo. ;)