Hitachi SH-G1000 User Manual page 25

Hold the main battery with the label surface facing upward, and then
3.
install the battery so that the grooves at both sides mate.
Using the stylus, shift the Full Reset switch upward to unlock it. (The
4.
switch is locked before the device is shipped.)
Replace the battery cover on the device.
5.
Full Reset Switch Full Reset switch Full Reset switch
Release
Section 2: Understanding Your Device
2A: Your PCS Phone – The Basics 17