Remove power before installing the Expansion Back.
Power off the device.
Remove battery cover and store in safe place.
On 8.4 in. version only, remove rubber gasket.
Align expansion back with device. Ensure that the power pack slot cover (1) is aligned with the bottom of the device and the interface connector (2) on expansion back aligns with interface connector on device.
Using a T6 Torx screwdriver, secure expansion back to device using four screws (1). Torque to 14 n-cm.