Samsung Galaxy S III User Manual page 158

Tip: For best results, before launching Software update,
connect your device to a Wi-Fi Access Point. For more
information, refer to "Wi-Fi Settings" on page 113.
1. From the More menu, tap About device
update.
2. Tap Check for updates.
3. At the Software update prompt, tap OK to continue.
4. The phone automatically updates the software (if
available), otherwise, when the Current software is up
to date prompt displays, tap OK.
5. When updating software, once the update file is
downloaded, you can delay the update on the start
screen by postponing it for a certain period of time. If
you want to resume the update before the selected
time, tap Continue update.
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