You need to drag'n'drop the firmware .bin file on the FUFlasher.exe in Windows Explorer. It'll auto-start the FUFlasher then, and should show the Update version 1.06. Ensure you're on the correct drive before flashing! Regarding the slow write speed, do you have verification during write active? That'll slow down the write speed to 50% of what you've chosen (i.e. 1x in this case of 2x writing).
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