Sony released a re-flash tool to update the device along with their first (of two) firmware update. This was later exploited to produce an english-ified version of the device (using the second and so far: final update.)
They never had to release full sources for the device, unlike iRex they wrote quite a bit of software rather than build upon OSS tools such as xpdf/minimo.
I never really felt the need to reprogram the Librie the way I constantly feel the need to do with the iLiad.
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