Grub error when boot from usb

I follow instructions on our site,
dd bs=1M if=nomadbsd-x.y.z.img of=/dev/sdX conv=fsync.

but when boot from usb,I get errors:
error: no such device:22xxxxx-xxxxx-xxxxx-xxxxx
error:unknown filesystem
entering rescude mode…
grub rescue>

How to fix this,thanks.

I disable other boot options and it works.
after nomadbsd installed,I open firefox,but it disappears after a short time.I click logout,I get error something like this" XXX child error XXXX”,I have to push power button to power off.After system reboot,I cannot login,only command prompt.I dd’ed again,this time I get error" failed to execute login command" something like that.How to fix it,thanks

Finally,it works!! It’s a great OS.Thanks, nomad

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