On Big Sur, to switch between kernel types during an update, run the cbcloud_install_unattended.sh script with either the -k or -e flag.

The -k flag will force a Kernel Extension sensor. The -e flag will force a System Extension sensor. See macOS command line parameters.

Your mount point might be slightly different than what is shown here: sudo /Volumes/CBCloud-3.5.1.19/docs/cbcloud_install_unattended.sh -i /Volumes/CBCloud-3.5.1.19/CBCloud\ Install.pkg -c [Company Registration Code] -k