I don't know if there is anything to be done at this point, but the only possibility I can see of any kind would involve opening up the KT4 and accessing the serial port. You would need the proper equipment, tools and ability to deal with tiny easy to damage contacts on the mainboard of the KT4. If you can interrupt the boot process and export the partition you should be able to put the correct firmware in place and then install it.
Dave
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