I'm in the same boat as xtreme... I flashed to AOKP0708, installed gapps, then 1.2.0... soft keys and wifi weren't working so I rebooted into recovery again, installed the 3rd party cbw.zip...
I've tried a couple different versions of AOKP, and the Original LY-F1 firmware you posted (which was in Chinese/Japanese, that was a good time! haha), wifi didn't work on any of them.
You can easily change the language of the original LY-F1 from settings to English and you will be fine.:cyclops:
Now, as WIFI didn't work on any of the ROMs you tried, I think that it is not the software that is causing the problem, it will be either the WIFI on the tablet itself (hardware issue), or your router settings, I suggest taking your table to a public WIFI and give it a try and see what happens.