Hello Camox,
Yes the download time for the DM1x00 displays are a bit longer than the rest of units. Especially when you are replacing the HWD file and OS.
I recommend to use USB when working with the DM1x00 displays. You will save a lot of time. When it take almost an hour downloading a new OS with CG150, it will only take a minute with the USB.
If you want to order you can find the part number in the image below (11231512). You can also find it in the Data Sheet.
Have a nice day.