Yes, I saw this page.
USB boot is not possible, because OBP doesn't have this option on my workstation.
Floppy install could be a solution, right, but I think you misunderstood me.
I don't intend to buy a new CD-drive, just new CD-RW discs.
My old CD-RW disc is a 13 or 15 years old CD, I think it's the source of the mess.
So, I bought new CDs to burn, and I'll try just after the dinner.
I also know 5.3 will be released soon, I use 5.3 snapshots on my OpenBSD VM.
I just want to try the Blade now, I'll install 5.3 later.
So I won't install ftpd, mysql or my documents on the Blade now.
I've got my OpenBSD 5.1 PC for that