This is likely the newest version you will ever get to work on the STAReBOOK. It is of course possible to "port" other firmware version, but you would need somebody to modify the Bookeen firmware so that it is accepted by the STAReBOOK. That kind of stuff is beyond my capabilities and I doublt any dev is going to invest all the time and effort for a pretty much dead platform like the STAReBOOK...
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