MD3000 Service Menu

Hi

i have a few MD3000i controllers and would like to reset them back to a default setup using this guide:

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Power on the MD3000i and press "CTRL B" when it starts to boot.

Type 10 and hit enter for "Serial Interface Mode Menu"

Type 1 and hit enter for "Console Only"

Type Q and hit enter to exit

Type R and hit enter to reboot.

Watch the boot sequence and when you see "sodMain complete", hit enter and type "sysWipeZero 1" and hit enter.

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My problem is when booting i press CTRL+Break but the system wont let me press S in time it just keeps booting until its finished. i been in the menu and reset to defaults before so i know it can be done.

Any ideas why it wont let me in?

Thanks

Glen