Got my FinalGROM 99 today and that thing is just mind blowing! Also that ZIP file on WHTech was super helful, now it is just plug & play.
Took me a while to find a SD card that works 100%, with all my Sandsik SDHC 32GB cards I got a blinking LED when powering up, even after a reset everything seems to work fine. Found an old Lexar SDHC 4GB card and that one works fine.
BTW the Jetpack ROM image from WHTech did not work on my setup. Not sure if it is the image or something else.