Kobo have been selective with the firmware releases of late. 3.0.x was only released for the Touch and 3.1.x has been released for the Glo, Aura and Aura HD. And nothing has been released for the Mini since 2.6.2.
If you want to try 3.1.1 on your Touch, it has to be manually installed. But, there is an issue with the USB connection not working for some devices. I think it is only the N905C model. It works perfectly for my N905 Touch.
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