I think there’s an outstanding fix that you can try:
edit the file /etc/modprobe.d/librem5-devkit.conf and change both instances of dev_oper_mode to 5, like in this change: https://source.puri.sm/Librem5/librem5-devkit-tools/-/merge_requests/217/diffs
You can do it using the terminal using sudo vim /etc/modprobe.d/librem5-devkit.conf. If you don’t have vim, you can do sudo apt-get install vim, or if you don’t like the editor, go for:
sudo apt-get install nano
sudo nano /etc/modprobe.d/librem5-devkit.conf
Then you need to save the file with your modifications and reboot.
Sorry for the trouble.