How do I enable High Altitude Brewing Mode?
Begin with the coffee maker plugged in and powered off, then press and hold the POWER button and 8 oz button together for 3 seconds. The 10 oz button will illuminate to confirm that High Altitude Brewing Mode has been enabled. To disable it, repeat these steps and the 6 oz light will turn on to confirm the mode is disabled. (Page 3)
From the official Keurig K-Express Essentials Coffee Maker manual, page 3
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