How to change device model in build.prop? The following is my build.prop file. I just can't find the device model option so I can modify it. I'm trying to change my device model to Pixel XL so I can run Google Assistant properly.

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=NMF26V
ro.build.display.id=lineage_titan-userdebug 7.1.1 NMF26V 399d12a5d9
ro.build.version.incremental=399d12a5d9
ro.build.version.sdk=25
ro.build.version.preview_sdk=0
ro.build.version.codename=REL
ro.build.version.all_codenames=REL
ro.build.version.release=7.1.1
ro.build.version.security_patch=2017-01-05
ro.build.version.base_os=
ro.build.date=Tue Jan 31 23:31:20 PST 2017
ro.build.date.utc=1485934280
ro.build.type=userdebug
ro.build.user=jenkins
ro.build.host=phenom.zifnab.net
ro.build.tags=release-keys
ro.build.flavor=lineage_titan-userdebug
ro.product.brand=motorola
ro.product.name=lineage_titan
ro.product.board=MSM8226
# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,
# use ro.product.cpu.abilist instead.
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.cpu.abilist=armeabi-v7a,armeabi
ro.product.cpu.abilist32=armeabi-v7a,armeabi
ro.product.cpu.abilist64=
ro.product.manufacturer=motorola
ro.product.locale=en-US
ro.wifi.channels=
ro.board.platform=msm8226
ro.build.characteristics=default
ro.cm.device=Pixel XL
# end build


Update: I have further changed the manufacturer and brand to Google and the product to Pixel XL, but it still had no effect.
Instead of doing it manually, here's an app that does it for you: Get Assistant - Root. From app comments in Play and local markets, it's verified to work with multiple models even on LineageOS.