RC6 boot from USB flash

RouterOS General
1

I try RC5 on USB flash work on my desktop and laptop now install RC6 and have problem to boot on desktop also on laptop, a see this error message.

Uncompresing Linux ... Ok, booting kernel.
ERROR: could not find disk!

Someone else have problem with booting from USB flash ?

2

RouterOS is ok, problem is my USB flash disk now install on another and work.