I made half the circuit published at https://community.onion.io/topic/130/debrick-with-serial/6 as described in https://community.onion.io/topic/157/reflash-omega-without-ethernet
I was trying to follow the instructions at https://community.onion.io/topic/67/onion-omega-seems-to-have-no-wifi
But can't connect to the tftp server. If all the connections are correct I guess I should be able to ping from my computer to the Onion, is this correct? If so, then I have to check my connections.
I have some resistors and a breadborard, but no capacitors at all.
...It sounds like is not going to be as easy as I expected :S
No, I just have the expansion dock, mini dock, arduino dock, and I'm waiting the shipment for the battery dock 
Hi Boken Lin.
You are right, I bought a new cable and I can see now the tty device. I typed the command "screen /dev/tty.SLAB_USBtoUART" and got a login message. After some research I used root/5up and finally got in.
I believe that I need to flash my device, if this is true can you send me please a link or any source of information?
Thanks in advance.
Thank you all for your support.
I installed today the drivers on El Capitan and rebooted just in case, but there is no change at all. Tonight I will try on a PC and will update the status. Meanwhile I'm attaching an image that might help to show any dumb connection I made.
...By the way I'm sure it's very well inserted into the expansion
Thanks!
I tested with dock and mini dock. On the dock, the rgb led start blinking then it stays on , but I don't detect the wifi. I'm testing on a Mac with El Capitan and already installed the Silicon Labs CP2102 driver, but the tty device never shows up.
I also have the Arduino dock (not tested yet) and I do not have the Ethernet expansion.
Is there anything that I can do ?