A USB update means to use a USB drive to update an OLPC XO laptop.
The concept is broad:
- using a USB drive to install a release, which erases all existing data on the XO,
- using a USB drive to update or upgrade from an old release to a new release, which preserves most of the existing data on the XO,
- using a USB drive to reflash firmare, and;
- using a USB drive to add activities,
 Install a Release
Read the installation section of the release notes of the latest stable release.
 Update or Upgrade to a Release
 Reflashing Firmware
See Upgrading firmware.
Prepare the USB drive with a set of activities, insert the USB drive into the XO, open the Journal, select the USB drive icon, then click on each activity.
See also Customization stick.