Yaesu FTM-100DR Update Instruction Manual page 6

Remove the rubber cap from the back of the PANEL
Set the slide SW on the PC board downward.
Push the RESET-SW button down. The display will flash one time. (We recommend using a small plastic
screw driver or equivalent; avoid using a metal tool because the radio is turned ON).
Connect the SCU-20 cable to the MAIN RF body rear mini-Din connector (the mini-Din connector notch
should be upward), and then connect it to the USB on the PC.
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