It is deliberate, but I didn't expect it to be mentioned in the calibre notes. I don't know if there will be a 2.5.3, and in fact, I don't expect one. But, if there is, it will be only a bug-fix release and is unlikely to change anything that the calibre driver depends on. Plus, I see the beta firmware and generally get a little warning of what is coming. If something appears in that that will cause a problem, I will make changes to the driver to prevent issues.
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