Sony PRS-900BC - Manual (Page 171)

171
Troubleshooting
Restoring default settings
You can restore all the default settings of the Reader.
The default settings will be restored as shown in the
table below:

In the “Home” menu, tap “Settings” tab 
“Restore Defaults.”
The “Restore Defaults” screen appears.
If “Device Lock” is set to “On,” the screen asking for
the password appears. Input the password, then tap
“OK”( page 157 ).

Tap “Yes” to restore default settings.
To cancel the operation, tap .

Follow the on-screen instructions to set the
initial settings.