Juniper Systems Allegro CE Manual - Manual (Page 170)

Page 4-110 Windows CE
If you tap on yes to proceed but have not previously performed a Save
System, the following screen will pop up. This screen tells you that a
system backup does not exist, and will give you the option to cancel
the Restore System.
▲ ▲ ▲ ▲ ▲ Set Factory Defaults
Set Factory Defaults deletes the existing Saved System that is on the
C_Drive, erases RAM, and reloads the operating system. When the
operating system is reloaded, the automatic restoration won’t find a
backup, so the system will come up and in the factory default
condition.
Before this selection is executed, the following message will pop up
describing what is about to happen with the option and if you wish
continue with or cancel the operation.