After you have the 5.13+ kernel installed you will see the device in network-manager. The main problem is that there is still an FCC lock on it which prevents you from enabling it in modem-manager. Hopefully it gets added to the https://snapcraft.io/lenovo-wwan-dpr snap. Until then I was able to get it working on a Lenovo X1 Yoga (Gen 6), Ubuntu 20.10, 5.13 kernel, Google Fi Data-Only SIM, and the following…
# Download network-manager, modem-manager, etc.,...
sudo apt update
sudo apt install network-manager network-manager-gnome modemmanager libqmi-utils gcc
# Reference: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/402#note_1064882
mkdir ~/Downloads/lenovo/snap
cd ~/Downloads/lenovo
# Download the snap
snap download lenovo-wwan-dpr --edge
# Extract the snap files
sudo mount -t squashfs -o ro lenovo-wwan-dpr_5.snap /home/$whoami/Downloads/lenovo/snap
# Download script by Joar Wandborg
wget https://gist.githubusercontent.com/joar/416f37fe81558f5be0d5131018eb7f2a/raw/b6a2a83620b044efc2d13aee86910743969218de/fcc-unlock.c
# TODO: manually modify the define statements in fcc_unlock.c appropriately
#define MBIM_DEVICE_PATH "/dev/wwan0p2MBIM"
#define MBIM2SAR_SO_PATH "/home/jonfen/Downloads/lenovo/snap/usr/lib/mbim2sar.so"
# Compile the script
gcc -o fcc_unlock_v2 fcc_unlock.c
# Run the script
sudo env VERBOSE=1 ./fcc_unlock_v2
# Enable the modem
mmcli -v --modem=0 -e
# Setup the connection, for Google Fi just pick the default T-Mobile profile, ignore their h2g2 APN
nm-connection-editor &
modem-manager-gui &