Most new modern computers don't have a sd card reader. I acquired a USB 2.0 card reader (which takes hours to update the BENZ updates). I have found that if you take a blank SD card and try to load the updates via the update software, it doesn't work in the unit. I had to get another SD card, as the first one I experimented with became "read only" and couldn't be formatted or erased. In the next attempt, I copied the folders for "fonts" and "res" and created a folder for "scan" to the new SD card. I copied the language and resource folders, as well as the items not in another folder (i.e. authorization, maxicheck.bin, etc). I updated a few vehicles, and the unit is functional now. Updating, the rest of the updates now.