Sony PRS-900BC - Manual (Page 173)

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Other Information
Updating the Reader Device
Software
By updating the Reader device software, you can
ensure your Reader has the latest features. The latest
software updates can be performed from the update
menu on Reader Library from “Help” – “Check for
Updates.”
For details on updates, refer to the Reader Library Help
or the following website.
http://www.sony.com/readersupport
Other Information