On a
working SM-N900V plugging the USB jig in to the USB port with the phone off causes it to boot into Download mode. (I just tried it last night)
Except it is slightly different: at the top of the screen the first line says "Factory Mode" instead of "Odin Mode".
But I don't really know what other any other differences are. Note though that I said
working SM-N900V, not hard-bricked. I seriously doubt that the USB jig is going to make your phone spring to life if you can't get into Download mode the usual way.
My guess is that your best bet is going to be finding someone who is on your same firmware release (OB6? OF1? ) and is rooted
**but not unlocked** and get them to build a debrick image for you:
create debrick image
Code:
su
dd if=/dev/block/mmcblk0 bs=16384 count=16384 of=/sdcard/of1debrick.img
Someone with a bootable SM-N900V would then do this:
raw write of debrick image to *spare* SDcard
Code:
su
mkdir /data/local/tmp
cp /sdcard/of1debrick.img /data/local/tmp/of1debrick.img
umount /sdcard
echo eject your good SDCard now and put a spare in there
echo IMPORTANT NOTE "mmcblk1" BELOW, NOT ...blk0
umount /sdcard
dd of=/dev/block/mmcblk1 if=/data/local/tmp/of1debrick.img
Because your phone is not booting, you are going to have to do the raw image write onto the "spare" microSD card in an equivalent way but with some other means. (I suggest you avoid using Windows.)
I would make one for you but my phone has never been on OF1.