Introduction
This is a guide for disassembling the motherboard and the screen.
Tools
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            Flip the phone over so it's facing screen-side up. 
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            Slide the screen upward by a few millimeters without detaching the screen. 
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            Use the plastic opening tool to pry off the front panel. 
 
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            Remove the bottom two Phillips #00 screws. 
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            Remove the bracket. 
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            Use the plastic opening tool to pry off the speaker. 
 
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            Remove the Philips screws #00 
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            Remove the rear blue panel by prying both sides using the plastic opening tool 
 
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            Remove the cable by pinching the sides and pulling 
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            Pry off the battery with the plastic opening tool 
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            Insert the new battery 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.