I have installed le latest version of Arduino IDE, of oct-14th-2015, but the same problem of no tty port continues.Not enough luck!
Followed the hookup in this link http://www.gammon.com.au/forum/?id=11635Programmer: Arduino as ISPTools->Burn BootloaderResult:"avrdude: Yikes! Invalid device signature. Double check connections and try again, or use -F to override this check."
Believe my connection are the same as in the link. I do not have a 10uF Cap between the reset and ground like some links indicate.
Can I update the boot loader with just a mac and the clone board?
2. Official Arduino Mega 2560 board Not detected. What driver should this use? FTDI driver?
Because the board features Atmel's own USB-to-Serial chip instead of an FTDI chip, there is no need for drivers under Linux or Mac (only an .inf file included with the Arduino IDE is required for Windows), and you have the ability to make the board show up as various types of devices.
I found this solution (https://www.kiwi-electronics.eu/blog?journal_blog_post_id=7):--------------------------------------Just like Yosemite, El Capitan requires kext driver signing. How this can be disabled in OSX 10.11 is changed however.To get the CH340 drivers to work in El Capitan you need to use the new tool csrutil as follows: Reboot and press CMD+R immediately after hearing the startup sound to boot to Recovery Mode Open Terminal Execute the following command: csrutil enable --without kext RebootClaudio