Note that there seems to be a problem with firmware 3.1.1 on the late model Kobo Touch (N905C, i.e. Mark 4 hardware) that I have not seen reported.
If you do a manual firmware update to 3.1.1 using Murg's direct link posted in the Developer's Area, everything will seem to go well. Once you try plugging your Kobo to a PC via USB, you will find that the reader goes into an endless reboot cycle and never appears on the PC (verified in linux and Windows 7). A Factory Reset will restore proper USB operation. This was tested on two different N905C Touches and both exhibited the same behavior.
USB connection to PC with firmware 3.0.1 works properly.
If you do a manual firmware update to 3.1.1 using Murg's direct link posted in the Developer's Area, everything will seem to go well. Once you try plugging your Kobo to a PC via USB, you will find that the reader goes into an endless reboot cycle and never appears on the PC (verified in linux and Windows 7). A Factory Reset will restore proper USB operation. This was tested on two different N905C Touches and both exhibited the same behavior.
USB connection to PC with firmware 3.0.1 works properly.