After upgrading my Nexus 5x to a new lineageos version it may sometimes show me a warning complaining about a vendor image mismatch.
In order to fix this, one has to download the right factory aosp image from google, extract the vendor.img file and flash it.
This bash script automates this process.
./extract-vendor-image.sh opm6.171019.030.h1
Use the vendor image id presented in the warning as parameter.
After succeeding the script will present you the commands to flash the extracted images on your phone.
adb reboot bootloader
fastboot flash radio vendor-image-bullhead-opm6.171019.030.h1/radio-bullhead-m8994f-2.6.41.5.01.img
fastboot flash bootloader vendor-image-bullhead-opm6.171019.030.h1/bootloader-bullhead-bhz31b.img
fastboot flash vendor vendor-image-bullhead-opm6.171019.030.h1/vendor.img
Theoretically this script should work with Nexus and Pixel devices, too. E.g. for a Nexus 6p
DEVICE=angler ./extract-vendor-image.sh opm6.171019.030.h1
But as I do not own one, I cannot test it :)
Of course the good old Nexus 5 and other older devices do not need this.