MacBook Pro 13" 2016 bluetooth not available after 10.13.4 update

No, it doesn't damage hardware.

A Troubleshooting Procedure that may Fix Problems with macOS El Capitan or Later

You should try each, one at a time, then test to see if the problem is fixed before going on to the next.

Be sure to backup your files before proceeding if possible.

1. Shutdown the computer, wait 30 seconds, restart the computer.
2. Disconnect all third-party peripherals.
3. Resetting your Mac’s PRAM and NVRAM
4. Reset the System Management Controller (SMC)
5. Reset your Startup Disk and Sound preferences.
6. Start the computer in Safe Mode. Test in safe mode to see if the problem persists, then restart normally.
7. Use Apple Hardware Test to see if there is any hardware malfunction.
8. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volume entry from the side list. Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
9. Repair permissions on the Home folder: Resolve issues caused by changing the permissions of items in your home folder.
10. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button under Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
11. Download and install the OS X El Capitan 10.11.6 Combo Update or 10.12.6 Combo Update or Download macOS High Sierra 10.13.4 Combo Update as needed.
12. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
13. Erase and Install OS X Restart the computer. Immediately after the chime hold down the Command and R keys until the Apple logo appears. When the Utility Menu appears:

1. Select Disk Utility from the Utility Menu and click on Continue button.
2. When Disk Utility loads select the drive (out-dented entry) from the Device list.
3. Click on the Erase icon in Disk Utility's toolbar. A panel will drop down.
4. Set the Format type to APFS (for SSDs only) or Mac OS Extended (Journaled.)
5. Click on the Apply button, then wait for the Done button to activate and click on it.
6. Quit Disk Utility and return to the Utility Menu.
7. Select Reinstall OS X and click on the Continue button.

If none of the above helps then make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.

Then you should probably do this:

Install El Capitan or Later from Scratch

If possible backup your files.

1. Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
2. Select Disk Utility from the Utility Menu and click on Continue button.
3. When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.
4. Click on the Erase icon in Disk Utility's main window. A panel will drop down.
5. Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.)
6. Click on the Apply button, then wait for the Done button to activate and click on it.
7. Quit Disk Utility and return to the Utility Menu.
8. Select Install OS X and click on the Continue button.

This will install the version of OS X you had installed.

I have the exact same problem on a Macbook Early 2016 after the latest update (10.13.4) of MacOS, I also tried every step mentioned above and still the bluetooth is unavailable. I even tried updating to the MacOS Beta 10.13.5 and still not working.

Same issue here, none of the suggestions resolved it. Have to say Apple is terrible with this kind of thing. A previous update broke bluetooth compatibility with a Sony external speaker unit (still not fixed). Now I have no bluetooth at all. Do they even test this ****?

Sorry, I can't speak English.

我的MacBook pro 13’ 2015，重装macOS 10.13.4后，蓝牙变得不稳定，经常不可用，频繁断开连接。重置SMC、MVRAM、删除蓝牙配置文件都不能解决。检测硬件也没有问题。我开始怀疑是第三方软件引起 的问题，再次重装macOS 10.13.4，没有安装任何第三方软件，依旧会出现问题。

从time machine恢复系统后，蓝牙变得正常。time machine中的系统是macOS 10.10升级到10.11、再升级到10.12、最终升级到最新的10.13.3。

用一个中国的词语来表达：玄学

I've had the same issue (and seen all of these suggestions before). I even tried a lot of them. BT controller / SMC / PVRAM resets, etc.

Here's what works for me: restart-bluetooth.sh

If you want to do these steps yourself, turn off Bluetooth, then turn off Wi-Fi. Turn on Wi-Fi, then turn on Bluetooth, and connect to each of your paired devices.

I'm sure they have no more idea than I do. Sometimes that happens.