It was well known, that Open Solaris Development Team doesn’t support osol USB image. genunix.org generate this automatically. And it’s recommended to use usbcopy shell script from within Open Solaris to dump that image into bootable flash drive. Yes, the folks had fuss about it. It is useless indeed, in my situation, to use Open Solaris to create another bootable source, since I don’t have Open Solaris on my system, and I don’t have “sane” optical drive.