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Sorry, I don't know what happened with old versions of the firmware - I bought mine with the current firmware installed.
If you're not going to use the machine for a while (say an hour or more) and you're not connected to your PC for charging, it's a good idea to switch it off. The "sleep mode" is low-power, but not zero power. There is an "auto power-off" setting which will automatically turn the machine off after a specified period of inactivity - I have that set to 20 minutes.
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