Venstar T-5800 Firmware Update
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On the Home Screen, Locate and press MENU
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On the Menu Screen, Scroll Down until you see SETTINGS, press SETTINGS
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On the Settings Screen, Locate and press INSTALLATION SETTINGS
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On the Installation Settings Screen, Scroll Down until you see UPDATE FIRMWARE, press UPDATE FIRMWARE
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A Box will appear showing the Status of Update
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After Completion of Update, Thermostat will be ready to operate normally