(You can achieve this of course also by changing the affiliate.)
Apply KBStartMenu_06_bugfix_01.zip (conf. previous post)
For devices the FW is meant for (Glo, Aura, Aura HD, Aura H2O)- enable wifi
- select "tools > checkbattery.sh" to see whether the battery is sufficently charged
- select "tools > Kobo FW update.msh > download FW.sh" (after a while the download will start; during the download you will see the update animation)
- select "unzip FW to kobo.msh > mark4 3.12.0.zip > extract" (you will see the update animation while the content is being extracted)
- select "handle update > install partial update" (while the device is updating, you will see the update animation)
For devices the FW is not meant for- enable wifi
- select "tools > checkbattery.sh" to see whether the battery is sufficently charged
- select "tools > Kobo FW update.msh > extra > download recent FW mark4.sh" (after a while the download will start, during the download you will see the update animation)
- select "tools > Kobo FW update.msh > unzip FW to kobo.msh > mark4 3.12.0.zip > extract only root tgz" (you will see the update animation while the content is being extracted))
- select "handle update > install partial update" (while the device is updating, you will see the update animation)
I tested this on Touch (C-model) and Glo.
As always, do this on your own risk!