Kobo: Download the latest version of XCSoar and install the software on the Kobo,
In XC Soar go to System and enable USB-OTG. Reboot the Kobo, run XCSoar in Flight mode, go to Config / Devices. Select device A: and edit the settings as follows:
Baud rate 4800
Bulk Baud rate Default
Passtrough device Off
Sync. from device Off
Sync. to device Off
You will have to this only once in XCSoar.
XC Tracer / XC Tracer II: Download and install the newest firmware. After the installation start the Vario just once in flight mode, and after this make the following changes to the config file:
sendDataOver=USB (sendDataOver=BOTH is also possible)
powerUSB=ON (only for XC Tracer II)
Please don't forget to save these changes!
Switch on XC Tracer / XC Tracer II and the Kobo.
Only now connect the powerbank with the USB cable. (Otherwise XC Tracer / XC Tracer II will start in USB MSD mode).
The connection between the Kobo und XC Tracer will be made automatically.
This was tested with Kobo Glo HD and a Kobo Mini; but Kobo Glo, Kobo Touch und Kobo Touch 2.0 should be compatible too.