I have one idea, test to put the file "wlan.ko" from your working rom to the target rom. The folder is "lib/modules" in system.img.
There are some files for wifi as wpasupplicant.... but they are parameters...
I think "wlan.ko" is a kernel module, if you change the kernel, you should change the module(s) too!!!
wlan.ko is kernel module, but it's just a wrapper to control in-kernel actual wifi driver.
in rk2818 tablets, some kind of wifi chip are used (at lease marvell, atheros, realtek, and probably broadcom). chip specific wifi driver is exist in kernel. wlan.ko just kick it. so same wlan.ko is used in many roms for rk2818 tablets.
what is different is, wpa_supplicant. in general android world, to talk in-kernel driver, special method was added to wifi driver. some wifi driver support it, so some wpa_supplicant uses it. some other wifi driver doesn't support it, so some other wpa_supplicant uses another method.
I think N3NET has driver/wpa_supplicant which uses android special method. if wifi chip/driver can use android special method, you can use wpa_supplicant in N3NET 2.3 ROM. otherwise, you need to replace wpa_supplicant.
wpa_supplicant for "another method" will work on tablet which supports "android special method". wpa_supplicant on my CM7 uses "another method" (because it's needed for my ONN N2), but no one claim about wifi yet
actually I don't know well about n3net 2.3.1 rom. I tried it only few hours, what I know is about wlan.ko, about difference between drivers and between wpa_supplicant, but I'm not sure which wpa_supplicant will work on your tablet.
Edited by fun_, 24 October 2011 - 09:01 PM.