Nothing to do, Just installed the emmc file on slot 1, the receiver does itself a reboot, but after that, nothing happens even when trying to switch from one image to another. I'll try to buy a Supreme for the third time, which already gave me big problems partitioning the SD card.
My friend, when you install an emmc Image, you lose all Images both in Flash and in Multiboot. At that time, you end up with only one installed Image, that in Slot 1. Nothing else. So, if you wish to boot to another Image, you have to install another Image in Slot2, 3 or 4, for example. Only then, you will be able to boot to a different Image in Slot 2, 3 or 4.
O.K. thanks, I'll try this way!

