i got a dangerous method for flashing broken eMMC of your device...i have tested this method on my 2nd device which got the same problem while flashing eMMC....

before you try my method i suggest you use Gparted live CD to fix your eMMC...if it works then you can skip my method....

now if Gparted live CD didn't works then try to reboot your device...if it boot like normal then play around with the device system files...make your device in reboot loop...once your got in reboot loop then you can easily flash your eMMC first then your fiasco images....

why make your device in reboot loop???
well if you look carefully while you flashing your device eMMC you will notice that the usb icon will disappear right after you start flashing & the five dots will appears(stuck after 2-3 seconds)...this show you that you have fails flashing your eMMC...
now if you make your device in reboot loop then your device won't try to load your eMMC on boot...this is the only way to you can flash your eMMC without any problem....

i have try testing this method several times using windows 7 32bit...it works all the time....

if you managed to flash your eMMC using my method then flash your fiasco images next....after completed flashing boot your device...if it boot normally then install backupmenu....using backupmenu + Gparted live CD to scan & fixed remaining problem on your eMMC....