You need a device that connects to the OBD2 connector. I use a Bluetooth OBDLink MX device for hardware and either "LS Droid" or "PCM Hammer" to do the writing. Tuner Pro RT for me is only for editing the BIN. My bench harness has a three amp Radio Shack power supply for a perfect 13.8 volts delivered to the PCM.
If you have already made a copy of your OS, it sounds to me like you already have the capability to write an OS. Or did somebody do that for you?
Rick
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