Do not do that as you will brick your box. Amlogic based TV Boxes only boot from emmc (except in rare cases).
No. boot.ini isn't even used by the balbes multiboot process.
I asked earlier if you could boot from an sd card (as that should work since you originally booted that way before installing on emmc). Again, I will repeat myself, don't expect to be able to boot from usb, that doesn't work on many amlogic based boxes.
