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.