Here is what Aeduino IDE is doing : Binary sketch size: 6,244 bytes (of a 28,672 byte maximum) Forcing reset using 1200bps open/close on port COM16 PORTS {COM1, COM16, } / {COM1, COM16, } => {} PORTS {COM1, COM16, } / {COM1, COM16, } => {} PORTS {COM1, COM16, } / {COM1, COM16, } => {} PORTS {COM1, COM16, } / {COM1, COM16, } => {} PORTS {COM1, COM16, } / {COM1, COM16, } => {} PORTS {COM1, COM16, } / {COM1, COM16, } => {} PORTS {COM1, COM16, } / {COM1, COM16, } => {} PORTS {COM1, COM16, } / {COM1, COM16, } => {} PORTS {COM1, COM16, } / {COM1, } => {} PORTS {COM1, } / {COM1, } => {} PORTS {COM1, } / {COM1, COM18, } => {COM18, } Found Leonardo upload port: COM18 C:\Program Files\Arduino\hardware/tools/avr/bin/avrdude -CC:\Program Files\Arduino\hardware/tools/avr/etc/avrdude.conf -v -v -v -v -patmega32u4 -cavr109 -P\\.\COM18 -b57600 -D .hex:i avrdude: Version 5.11, compiled on Sep 2 2011 at 19:38:36 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2009 Joerg Wunsch System wide configuration file is "C:\Program Files\Arduino\hardware/tools/avr/etc/avrdude.conf" Using Port : \\.\COM18 Using Programmer : avr109 Overriding Baud Rate : 57600 AVR Part : ATmega32U4 Chip Erase delay : 9000 us PAGEL : PD7 BS2 : PA0 RESET disposition : dedicated RETRY pulse : SCK serial program mode : yes parallel program mode : yes Timeout : 200 Apparently, the forced reset is not completed with visual micro and the board does not switch to the bootloader on PORT 18
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