Yes, flashing emmc.bin would have also been my next advice.

But I am afraid the device memory is dead.
There have been too many occurences like this.

download broken - unlikely, but possible
bad usb cable - would be the easiest to check/change
bad partition table - very unlikely if you did not tinker with layout (as I did )
broken mmc - unfortunately likely as happened often and HW is old

Also it matches that your device did just shut down.
Sorry

Nevertheless try again with both firmware.bin and emmc.bin.
Maybe --erase-user-data and I do not remember by heart but something like --reset-partition-table (have a look with --help before).