Introduction
If the CMOS Sensor within your Zerodate T26 mouse is not working due to damage or debris, follow this guide to remove and replace the part. Follow this step-by-step guide with a plastic opening tool to pry the mouse open, a Phillips screwdriver to remove the plates, and a soldering iron to begin replacing them. New CMOS sensors and red LEDs can be purchased online.
Tools
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Remove the top shell of the mouse by using the iFixit opening tool to carefully pry the top shell apart from the bottom plate.
 
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Carefully pull the middle shell apart from the bottom plate.
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The circuit board should then be visible and attached to the bottom plate.
 
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Remove the battery from the mouse as shown, and set it to the side for later.
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This should now allow you to gently pull the circuit board up from the bottom of the mouse.
 
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To replace the CMOS sensor attached to the circuit board, carefully de-solder it from the board, found here.
 
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To reassemble your device, follow these instructions in reverse order.