What is the command sequence to force a Cisco Nexus 6000 switch to boot using the golden BIOS image?

Ctrl-Shift-6 is the correct key combination, but 30 seconds is incorrect - the timing window is only 2 seconds after power is supplied to the switch.

Ctrl-] is used on some Nexus platforms to interrupt the boot loader, not to select the golden BIOS on the Nexus 6000, and the 2-second window specification is also wrong here.

Both the key combination (Ctrl-]) and the timing window (30 seconds) are incorrect for the golden BIOS selection procedure on the Nexus 6000.

The Nexus 6000 provides a 2-second window immediately after power is applied during which pressing Ctrl-Shift-6 redirects the boot process to the golden BIOS, a factory-protected image that cannot be overwritten and serves as a failsafe recovery path. The window is intentionally short at 2 seconds to avoid accidental triggering, so any delay beyond that causes the switch to proceed with the normal primary BIOS boot sequence.