How do I activate High Altitude mode on the Keurig K-Supreme Plus?

To enable High Altitude mode for use at elevations of 5,000 feet or higher, press and hold the brew button and 8oz button together for 3 seconds. This setting ensures the brewer works properly at higher altitudes. (Page 6)

From the official Keurig K-Supreme Plus SKS910BK Coffee Maker manual, page 6

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