Introduction
This guide demonstrates and describes proper removal and replacement of the back casing. It is needed to access other parts for repair or replacement.
Tools
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            Locate battery cover on the back of the case. 
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            Slide battery cover to the right reveal the batteries. 
 
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            Remove battery cover. 
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            Slide the red lock down. 
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            Slide the metal tab to the right of the top battery. 
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            Remove the 3-Volt Lithium Coin Cell Battery. 
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            Slide the red lock up. 
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            Slide the metal tab to the right of the bottom battery. 
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            Remove the 3-Volt Lithium Coin Cell Battery. 
 
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            Using a Torx, T-6 star-bit screwdriver, unscrew four 7.38 mm screws from battery housing. 
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            Unscrew four 7.15 mm screws from back casing. 
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            Using the blue plastic opener tool along the seam of the case, pry off front casing. 
 
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To reassemble your device, follow these instructions in reverse order.