Q: do i have to update if i need to enable my grated wifi ?

Hi ..

Reset the device:

Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.

If that doesn't help, tap Settings > General > Reset > Reset All Settings

If that doesn't help, tap Settings > General > Reset > Reset Network Settings

You may have to re enter your Wi-Fi password.

If nothing above has helped, try here >  iOS: Troubleshooting Wi-Fi networks and connections

For Bluetooth >  iOS: Troubleshooting Bluetooth connections

See:

iOS: Wi-Fi or Bluetooth settings grayed out or dim

One user reported that placing the iPod in the freezer fixed the problem.

Also heating sometimes works. See:

Why can't I select my wifi settings?

A trick that works frequently with iPhones:

Settings > AirPlane Mode ON, Do Not Disturb ON

Power down and wait 5-10 minutes

Power up

Settings > AirPlane Mode OFF, Do Not Disturb OFF

If not successful, an appointment at the Genius Bar of an Apple store is usually in order.

Apple Retail Store - Genius Bar

I had the same problem with my iphone 4S, ios 7.1.2. The wifi button was grayed out for some time now. I tried several methods that I found in various forums, including the reset of network settings, airplane mode, fridge and more. NOTHING!

Then I finally did what I wanted to avoid - the heating method, and it worked as follows:

1. iPhone turned on, I held a hair dryer close to it while keeping the screen on and watching it while heating the iphone with the hair dryer.

2. When the temperature warning came up on the screen, I put the iphone aside to cool up in room temperature (shut off the display). I turned it on/off couple of times until I saw that the warning was gone and normal screen came back.

3. The wifi was still grayed out.

4. I then did the network settings reset,

iphone wifi was back to normal!!

I had the same problem with my iphone 4S, ios 7.1.2. The wifi button was grayed out for some time now. I tried several methods that I found in various forums, including the reset of network settings, airplane mode, fridge and more. NOTHING!

Then I finally did what I wanted to avoid - the heating method, and it worked as follows:

1. iPhone turned on, I held a hair dryer close to it while keeping the screen on and watching it while heating the iphone with the hair dryer.

2. When the temperature warning came up on the screen, I put the iphone aside to cool up in room temperature (shut off the display). I turned it on/off couple of times until I saw that the warning was gone and normal screen came back.

3. The wifi was still grayed out.

4. I then did the network settings reset,

iphone wifi was back to normal!!