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This question already has an answer here:

Unable to flash Arduino when TXD pin of HC-6 Bluetooth module is connected to Arduino RXD pin?

I get the following error:

Flashing with command:C:/Users/home/.arduino-create/arduino/avrdude/6.3.0-arduino9/bin/avrdude.exe -CC:/Users/home/.arduino-create/arduino/avrdude/6.3.0-arduino9/etc/avrdude.conf -q -q -patmega328p -carduino -PCOM4 -b57600 -D -Uflash:w:C:/Users/home/AppData/Local/Temp/arduino-create-agent051272951/sketch_jun10a.hex:i

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x48

marked as duplicate by Chris Stratton, Greenonline, gre_gor, Code Gorilla, SDsolar Jun 16 '17 at 17:19

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migrated from electronics.stackexchange.com Jun 16 '17 at 1:31

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Most* Arduino devices are flashed through a bootloader which communicates over the serial pins. If you've connected another device to those pins, that communication may fail. You may need to disconnect the device while you flash the Arduino.

(*: The exceptions are the 32u4-based devices, like the Leonardo and Micro. These communicate directly over USB.)