The build.prop file confirms that your tablet is Next7P12-8G-NXM727MCMC-WM, however Yifang Digital/eFun/Nextbook used at least two different WiFi chips in that model. You can't identify the WiFi chip from the build.prop file.
There are 3 possible ways to identify the WiFi chip.
1. If the device will boot, you might be able to identify the WiFi by typing "lsmod" or "dmesg" in a shell terminal. (This might not work).
2. Flash a ROM and pray... if WiFi doesn't work, flash a different one... (It's always possible no ROM will work perfectly.)
3. Open the device and read the label on the WiFi chip. (This is the only way to be sure everytime.)
Good luck.
ShaunMT
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