Sm-g928f bootloop download mode powers down - Galaxy S6 Edge Q&A, Help & Troubleshooting

Hello Guys, I am hoping some pro can give me some advice on my Samsung SM-G928F.
I tried flashing an older version of firmware with odin, which failed on the final stage.
After which I am now stuck at error occurred while updating the device software. use the emergency recovery function in smart switch.
Smart Switch asks for the model and serial, so I input and it then tells me my device is unsupported.
I can access download mode for about 4 seconds, before the phone flashes on and off disconnecting itself from the usb com, then reconnecting loop.
I have tried different button combinations and various usb port and different usb cables, but I cant get the phone to stay in download mode long enough for Odin to flash new firmware, before it restarts and disconnects?
Any help would be greatly appreciated, and thank you in advance.

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