Use this guide to replace the back casing and to remove the back casing to access the interior of the phone.
Apply downward pressure to the top of the battery panel while pulling down to slide it off the phone.
Locate the grooves on the sides of the battery near the bottom of the phone. Use your fingers to pull the battery up and out of the phone.
Use the spudger to pry the two plastic caps out of the top corners of the phone casing.
Remove the six 4.0 mm screws using the Phillips 00 screwdriver.
Insert the plastic opening tool in the gap between the back panel and rest of the body.
Slide the tool along the edges until the two pieces come apart.