There are a few instances in which it is necessary to perform a full reset on an eTrex 10/20/20x/22x/30/30x/32x, including the following:

Not receiving a satellite signal
Restoring the factory default settings
Not functioning properly

The information and steps below will walk you through backing up your data and resetting.

Before Resetting

Performing a full reset can cause user data loss. User data is waypoints, routes, tracks and geocaches.

It is recommended to back up important data with BaseCamp before resetting. For steps, see Related.

If removing data is desired to eliminate corrupt data or free up space, see Related.

Performing a Full Reset

Power the eTrex off
Press and hold both Menu and Enter¹
Press and release Light/Power
Wait to see, Do you really want to erase all user data? then release Menu and Enter
Select Yes

The eTrex is now reset. You will want to take the device outside in a clear view of the sky for a minimum of 20 minutes to re-acquire satellite data.

¹Enter is pressing the center of the thumbstick down. It is important that the thumbstick does not move to any side, as this will prevent the reset from working.