How do I enable High Altitude Brewing Mode?
Power the coffee maker off while it is plugged in, then press and hold the brew and 8oz buttons for 3 seconds. The 12oz button will illuminate to confirm that High Altitude Brewing Mode has been enabled. This mode should be used if you are operating the coffee maker at higher altitudes (1,500 meters/5,000 feet or above). (Page 2)
From the official Keurig K-Slim Single Serve Coffee Maker manual, page 2
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