E5470 - cannot install Dell Default Factory Image

Following these instructions, I have downloaded a Factory Reset image for my Latitude E5470. I burned the image to a 16GB microSD, as I do not have a 16GB USB stick at hand (only smaller or larger).  Booting from the SD card works and I get the following screens:

The process terminates with the message "not available for this computer". Am I missing something here?