Thank you rkomar and mobama for your answers !
Previously with the Kobo Aura One, the KSM (Kobo Start Menu) was set to alternate at power up time between the generic Kobo reader app and the KOReader and I would like to do the same with the Inkpad 3...
So by simply turning off and on the device, I may switch from one soft to the other to benefit from each specific features !
And in case of problem with an update for example, I will be able to reboot the device with the alternate soft...
Is it possible to do that with a modification of the autorun.inf or another file ?