@Theodore-Borromeo soldering flash chip could be major PITA, because you'll have to remove the metal shield first.
@Costas-Costas the ability to connect to an access point is in the minimal package. There is no GUI for it. You will have to edit two files:
Here is my network file. I disabled the lan bridge and the ethernet, since I don't use them. The configured the wireless wlan0 to use dhcp.
Here is my wireless config. My network uses WPA2. The LEDE web site has decent docs on these files.