Usb type to reflash pureboot?

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How to update coreboot offline

Is there any documentation explaining how I can update Coreboot on my Librem laptop in offline mode, i.e., without Internet access? The background is that I am using Qubes OS and it’s strong isolation between network VM, update VMs, and other VMs gives me a great peace of mind. I do not want to abandon my security practices after that. According to the official documentation, I would have to boot PureOS from a USB stick, connect to the Internet, and run the corresponding script, which will do…