Librem 14 Qubes OS

Hardware Librem (Other)
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10
  1. Start with booting into the PureOS image on a USB drive. From here, you have two options:
    a. Follow the official instructions on updating the EC firmware. Requires a second USB drive.
    b. Follow the advanced method by @NineX. This is how I do it.
  2. After updating the EC firmware, restart the Librem 14.
  3. Reboot into the PureOS image on the USB drive. From here, again, two options:
    a. Follow the official instructions on updating PureBoot. Requires a second USB drive.
    b. Follow the official instructions above, but flashing Coreboot instead, then restarting the Librem 14, rebooting into PureOS, then flashing PureBoot over it. This is how I do it.
  4. Restart the Librem 14, then on the first PureBoot prompt, choose “OEM Factory Reset / Re-Ownership” to reconfigure everything to OEM settings.

I assume the three flash drives you have are, in order: Librem Key; PureOS 10.3; and PureBoot update. You will only need the first two for these steps outlined above if you follow my methods. You can use the remaining USB drive for the official methods if you prefer.