Then to enable tethering and hotspot
1. Download the enabletether-JOP40D that stridger (The creator of the post(Thanks!!)) upload or the enabletether-JOP40C according to your nexus 7
2. And connect your nexus 7 to your computer and save the “enabletether-JOP40D.zip” on the root directory of sdcard
3. Then turn off your nexus 7 and turn it on in fastboot mode again pressing and holding volume down and power up.
4. Then navigate through menu with volume up and volume down, to “Recovery Mode” and press power button to choose, then wait a little, it should show you a menu.
5. Here choose “Install zip from sdcard” > Choose zip from sdcard > 0/ > enabletether-JOP40D.zip or wherever you save it and press power buttom to choose it, wait to the installation ends, and that’s all, reboot your nexus 7, and look for the option in Settings > More Settings > Tethering and portable hotspot
Hope this help people like me that have this problem.
Thanks everyone