Firmware 3.10 has been out since August 28 for the eTrex Legend HCx and several other eTrexes have similarly dated firmware updates:
Changes from version 3.00 to version 3.10:
Fix potential lock up when SD card installed.
Fix the contour data intermittently drawing over interstates of Topo Map.
Improve the blue shading color when using the setting 'Marine colors' in Daytime display mode.
Correct the brightness can't move over 50% in eTrex Vista HCx.
Correct upside down direction of vertical speed.
Fix incorrect highlight index at unit field in 'Area Calculation' page after select reset in menu.
Firmware 3.10 has been out since August 28 for the eTrex Legend HCx and several other eTrexes have similarly dated firmware updates:
Changes from version 3.00 to version 3.10:
Fix potential lock up when SD card installed.
Fix the contour data intermittently drawing over interstates of Topo Map.
Improve the blue shading color when using the setting 'Marine colors' in Daytime display mode.
Correct the brightness can't move over 50% in eTrex Vista HCx.
Correct upside down direction of vertical speed.
Fix incorrect highlight index at unit field in 'Area Calculation' page after select reset in menu.
Use WebUpdater or check here for your eTrex:
http://www8.garmin.com/support/blosp.jsp