Hello, I would like to share my progress. I finally managed to connect Omega2 to my router. The problem was the encryption type. My router uses "TKIP" but Omega2 has "AES".
So, I entered the following:
uci set wireless.@wifi-iface.ApCliEncrypType=TKIP
uci commit wireless
Note: The firmware I am using is 0.1.7 b139 because for some strange reason the firmware update downloads this version instead of 0.1.8. But it works