New 2011 MBP 13" doesn't want to boot from USB

Just got brand new 2011 MBP 13" and tried first boot from the external bootable clone of up to date system volume from my older MBP - no go at all. It allows me to select the external USB volume to boot from but then it stays on the gray screen with Apple logo doing nothing.
Old MBP boots from the same external USB with no problem, boots as well from the clone of my iMac without chocking. But nothing happens with new 2011 MBP 13".
Both external volumes mount and show as start-up disks, but no matter which way I try to boot new 2011 MBP from any of them it just doesn't work.
Any help?

What you mean by "too old"?
They don't have the needed drivers, which are only present on the new MacBook Pro models. A Mac OS X version which shipped with a Mac counts as newer than a copy with the same version number that was attained through usage of the downloadable updaters.
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