Soft reset

Perform a soft reset of your iPAQ Pocket PC by inserting the
stylus into the unit reset switch at the bottom of your iPAQ
Pocket PC, then pressing the switch for one second.

Compaq iPAQ h3875 Hard reset Soft reset
2. Unit Reset Switch: reset with stylus

Hard reset

A full reset can be performed by simultaneously pressing the two outer application buttons and the reset button on the bottom of the handheld for 10 seconds.