EMMC Flash Problem

I have been trying to flash the emmc from my BBB

I did modify the /boot/ file so it does the flashing directly from the micro SD

The micro SD has been written with Win32 Image Writer

When I boot with the microSD, all 4 leds go sequentially. After a couple of minutes, led USR1 stays on and the process is hang up.

Any other ways to flash the emmc?

Thanks
Felipe Brito