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  • Did you set the same USART speed on HC06 as bootloader uses? (You have to use this speed in your program too) Commented Sep 5, 2016 at 21:51
  • BTW with HC05 it's much easier as there are two LED indicators and LED2 indicate successfull connection. So if you use AT+POLAR=1,0 to set active low mode for LED2, you can connect it as DTR input. Commented Sep 5, 2016 at 22:05
  • @KIIV, Thanks. I have set the BAUD rate through the TTL for HC60 and now the uploading works as expected. By the way for Arduino Pro Mini 5V 16mGhz the baud rate is 56700. At this speed the bootloader works, you can check it in the boards.txt file. With HC05 is simpler but also requires soldering, thus the difference is not big. Commented Sep 6, 2016 at 8:04
  • I do not know how to vote it or how to mark it as answered. Commented Sep 6, 2016 at 8:06
  • I'll make it as answer Commented Sep 6, 2016 at 9:08