dd if=/path/to/opnsense.img of=/dev/device_of_usb_stick bs=4k
Also having the blank img file on the USB Stick or a SD Card both would be there to select but both can't be selectedhave a nice day
Perhaps this is also a new puzzle piece: https://reviews.freebsd.org/D12471All together, it currently looks like a FreeBSD 11.x / SDHCI (xHCI) / Kernel problem.
In which way did you find this review?