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They've only done the one public update, which was the 1.1 which added ePub & PDF reflow, although the UK, French & German releases came with 1.2, 1.3 & (iirc) 1.4 firmwares. The core behaviour appears the same, with the 1.2 having a European date format, while 1.3 has localisation support (not sure about 1.4).
As noted, the point versions have been creeping up, but there's no information about what the changes are nor any way of updating to them...
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