MobilePro 900 Flash ROM - CF Card vs SD Adapters

Just an FYI. If you're attempting to flash ROMs (i.e. HPC2000, CE 4.2, or CmoneX v2) onto the MobilePro 900, you must use an actual CF card. An SD card in a CF adapter does not work.
Which makes sense, it's low level bootloader functions. I'm sure the adapter uses some generic driver once CE boots. (I just figured this out yesterday)

I just wanted to post in case it's helpful