Introduction
Replacing the back case of the BlackBerry Bold 9900 is a tedious task, but it will allow you to become more familiar with your device, increase the lifespan of the device, and reduce e-waste.
Tools
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            Place phone screen down. 
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            Use your finger to life upward on the battery case. 
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            Pull the cover away from the battery. 
 
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            The Mini-SIM card is located inside the red rectangle. 
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            To remove the Mini-SIM Card, push and slide the card inward towards the top of the phone. It will be ejected. 
 
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            The MicroSD card is located where the red rectangle is shown. 
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            To remove MicroSD card, push the card inward towards the top of the phone then release. The MicroSD card will be ejected. 
 
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            Using the T5 Torx Screwdriver, remove the four torx screws that are located on the bottom half of the device 
 
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            Now, carefully and gently using your fingers, lift and remove the assembly from the back case. 
 
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To reassemble your device, follow these instructions in reverse order.