During startup, you should release the MODE button when which event occurs?

• A. Immediately after power-up
• B. After the display shows ready
• C. During startup only after the initial sequence
• D. When audio beeps once

Answer: (D)

The timing of releasing the MODE button is tied to a specific signal the device provides during boot. The single audio beep serves as the cue that the device has recognized you’ve held the button long enough and is now in the correct window to switch into the desired startup mode. Releasing at that moment ensures the bootloader registers the input correctly and enters the special mode, rather than continuing with a normal startup.

If you release immediately after power-up, the system may still be powering up and miss the input window. Releasing after the display shows ready is past the window where the mode switch is accepted, so you’ll miss the intended mode. Releasing during startup after the initial sequence is vague and may not align with the specific handshake the firmware expects. The audio beep provides a clear, reliable signal for the exact moment to release, making it the best choice.