Denon RCD-M39 Service Manual page 31

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(6) Unzip the "BootTool_M330.zip" and double click the icon of "BootTool_M330.exe".
(7) Please confirm "Connected" on state space.
If "Connected" is not indicated, please check connection with unit or setting of ComPort or Boudlate.
Press "Connect" button.
"Connected" will be indicated.
(8) Select the Ram File and Flash File.
Press "..." button on "Ram File" and choose "OnBoard_M330.s32" file.
Press "..." button on "Flash File" and choose "RCDM39_yymmdd-0z.s32" file.
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