Just a note that after a lot of trouble with multiple computers and com ports, I had success flashing a gotek with using an arduino uno. Wired reset to ground (on arduino) to prevent arduino from booting. Was on a xp machine, and baud rate set quite low. Took a bunch of attempts to connect but got there in the end. From memory the Tx and Rx were not wired as expected. Once the flashing software started saying "unrecognized device" it was just a matter of resetting gotek and trying again until it worked.
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