modprobe usb-storage ## This is only needed once after each reboot
mkdir -p /tmp/usb ## The -p tells mkdir not to complain if /tmp/usb already exists
mount /dev/sda1 /tmp/usb
cp -v /etc/rootcert/*.der /tmp/usb/ ## The -v means "verbose", showing exactly what gets copied
umount /tmp/usb
sync
I think I got them all with that. I didn't get anything verbose during the process, but when I opened the USB drive the files were there! Not sure how I can thank you enough. I don't imagine this is the sort of thing I would have be able to piece together myself with such limited knowledge of Linux commands and errors. If there's something you might need in the future please let me know!
Now I need to go obtain an ER-4 to load the cert file onto (using a tool that combines the .der and mfg.dat files). I think setup on that is generally better documented then this backdoor bypass procedure so I should be okay there.
Thanks again and happy St. Patrick's Day!
Stu