Wifi no hardware installed

Try resetting SMC: Resetting the System Management Controller (SMC) on your Mac - Apple Support

You have to find the section for your MBP based on whether the battery is removable or not.

In some cases, this issue is caused by a hardware fault. A loose connection, a short circuit, or a microscopic break in a solder joint may open and close depending on temperature, making the failure intermittent.

Test after taking each of the following steps that you haven't already taken. Back up all data before making any changes.

1. Turn off Bluetooth. If you have a desktop Mac, you'll need a wired keyboard and mouse to take this step. Those are useful to have anyway, because Bluetooth is not completely reliable. If Wi-Fi works with Bluetooth turned off but not when you turn it back on, delete all pairings in the Bluetooth preference pane and recreate them. Restart the computer and test again.

2.. There are a few reports that the problem was solved by unchecking the box marked

Wake for Wi-Fi network access

in the Power Adapter tab of the Energy Saver preference pane. I can't confirm.

3. Reset the NVRAM.

4. Reset the System Management Controller.

5. Start up in Recovery mode. In the menu bar of the OS X Utilities screen, there's a Wi-Fi menu. Try to connect.

6. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

Hold down the option/alt key and go to the  menu/System Information. Does it show a W-Fi card installed?

Do you mean you tried an SMC reset and it didn't restore the WiFi or something else went wrong while trying an SMC reset and you couldn't complete it?

The lack of information and the actual WiFi card means there is something wrong either with the card or with the ability to communicate with it.

It is possible that the connection came loose, but it would have had to be poorly connected in the first place for it to get loose. The ones I have torn down pop on pretty tightly.

If all of the options suggested have not restored it, then I would take it into Apple to have it diagnosed.

Linc, thank you from the bottom of my heart for taking the time to help others by posting these instructions. I am going through such a hard time in my life and once I realized my WiFi was completely not working I felt like I was going to lose it. Luckily I was able to use my phone to find the instructions and was beyond grateful for finding the post you made on this page.

Thanks to you I was finally able to get my Wifi after resetting the NVRAM. I know we shouldn't be so dependent on our ability to stay connected through the internet or technology, but at this time of our lives information that people like you provide to others who are not as knowledgeable is a blessing. I don't mean to be too dramatic, but I cried tears of joy after fixing such a small issue and I cannot thank you enough for helping me through a moment of such intense fear, seeing as how dependent I actually am on my ability to connect. It's a big part of my life. Thank you so much again and I wish amazing things in your life and I hope you are blessed by the work that you do. It truly makes a difference.

Much peace and love,

Lucas