St Link Is Not In Dfu Mode

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1) click on ST-LINK->Firmware update. 
2) When the "ST-Link Upgrade" dialog appears, unplug and physically reconnect the board.
3) Finally click the "Device Connect" button from the dialog.

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ST-Link is not in the DFU mode.
Please restart it.

OpenOCD child process termination

Reason:
Wrong device detected

Details:

Wrong device detected
  Open On-Chip Debugger 0.10.0-dev-00302-gc211ca5-dirty (2017-07-03-10:41)
  Licensed under GNU GPL v2
  For bug reports, read
    http://openocd.org/doc/doxygen/bugs.html
  none separate
  Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
  adapter speed: 950 kHz
  adapter_nsrst_delay: 100
  Info : clock speed 950 kHz
  Info : STLINK v2 JTAG v27 API v2 SWIM v6 VID 0x0483 PID 0x3748
  Info : vid/pid are not identical: 0x0483/0x374B 0x0483/0x3748
  Info : using stlink api v2
  Info : Target voltage: 3.236436
  Error: init mode failed (unable to connect to the target)
  in procedure 'init' 
  in procedure 'ocd_bouncer'
Can not connect to target!
If you're trying to connect to an STMW1xx device, please select
Normal or HotPlug mode from Target->Settings menu.
If you're trying to connect a low frequency application, please select
a lower SWD Frequency mode from Target->Settings menu.
ST-Link is not in the DFU mode.
Please restart it
No ST-LINK detected
No ST-Link device detected
Please connect it and then retry

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