The altimeter display is stuck on Meters....I need to change it back to Feet. I followed the directions, but it won't change....any thoughts?

Tech Specs:

Housing Material:

plastic 

Altimeter:

yes 

Altimeter Max Height:

30,000 ft 

Heart Rate Monitor:

no 

Barometer:

yes 

Thermometer:

yes 

Digital Compass:

yes 

Adjustable Declination:

yes 

Chronograph:

yes 

Backlight:

yes 

Computer Compatible:

no 

Water-Resistant:

yes 

Alarms:

4 

Alarm Type:

, 

Low Battery Indicator:

yes 

Recommended Use:

Mountaineering, skiing 

Manufacturer Warranty:

1 year