Many users have problems with the fact that when you upgrade applications in Google Play smart phone gives an error DF-SA-01. That's interesting.
Begin to look for a solution DF-SA-01!
The Internet is little information on the topic: "Error retrieving data from the server df-sa-01" and reduced it to this:
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Settings \ Applications \ All: For the Google Play Store, Google Services Framework and Services Google Play, do: stop, delete data, delete, update, clear the cache.
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Settings \ Accounts \ Google account to sync settings, remove all ticks.
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Restart your smartphone or tablet.
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Immediately after the restart Settings \ Accounts \ Google and put a tick back (when a timing error not paying attention).
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Restart your smartphone or tablet.
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Check the device.
Perhaps this method does not work (the result unsubscribe in the comments), and then you should go to the website and find APKMIRROR Google Play and download free. Next you need to fill in the device. Add to Settings / Security - the ability to set of the unknown devices and install the apk applications Google Play. If an error trying to throw out other versions apk application.