Updated to 10.13.5, lost Bluetooth

I have this problem too on my MAC BOOK PRO Mid 2015 on 10.13.5

I was speaking with Apple Support, we made all restets, all test and diagnostic and from hardware everything is fine.

The last what i should do is reinstalling system, if it will not help they told me to reinstall system on Clean disc.

If it will not help go to service :/

Ok here's an update on my situation... Another phone call to Apple resulted in being told to either mail it to them, or take it to an Apple store, or another service provider. So there's a Simply Mac not too far away and I took it there. They confirmed it was NOT a hardware problem, but they did have to do a complete reformat and reinstall. I'm on 10.13.5 now and everything seems to be working fine.

I have unplugged all cables from my laptop (external video, power cable etc.) and shutdown it for 10 minutes. After starting it up again, bluetooth was available again.

Note that rebooting or shutting down for 1-2 minutes didn't help me.

Good luck!

I have done SMC reset, PRAM reset, NVRam reset, blatted the pref file, debug and reset BT module, shutdown and waited 10 mins, time machined back to an earlier backup, formatted and installed 10.13.4 from USB, formatted and installed 10.13.5 from internet recovery, run diagnostics with all ok, and a number of other things including speaking to apple 3 times and nothing has worked so far.

I'm running a 2.2ghz interl core i7 16gb DDR3 1600 Mhz RAM, mid 2015 retina 15 inch matchbook pro, MacOS 10.13.5, with the following showing for BT - apple BT software 6.0.6.f2, firmware version v5 c4096, vendor ID 0x0A5C, product ID 0x21FF, HCI Version 4.1 (0x7).

I'd be interested if others having the same problem have similar set-ups - i.e. is this effecting a specific chipset, model etc.

I have switched things off and on in various ways as suggested above but still no Bluetooth.

I found if I run Create WiFi Diagnostics (on the WiFi Pulldown with option shift)

There is a section on Bluetooth status

# --- Bluetooth Status

Power : Off

MAC Address : None

Discoverable : No

Connectable : No

Scanning : No

Devices : 0 (paired=0 cloud=0 connected=0)

Which indicates everything is off.

Wheres the Bluetooth menu indicates Bluetooth is on and cannot be turned off (because that option is greyed out).

And the the System report (About this Mac) which indicates Bluetooth is on.

Apple Bluetooth

Exact same problem after 10.13.5 update in to my iMac Retina 5K, 27", late 2015.Just updated to 10.13.5 bluetooth now completely broken. Cannot turn it off (option is grayed out), cannot connect to any known devices, new devices no appearing in list. Resetting SMC, NVRAM, bluetooth module. I can not find BT preferences for deleting.

Unplugging everything and turning my Mac off for 20 minutes worked. Shutdown, not restart. I can connect everything to Bluetooth again, and I can turn Bluetooth of and on now. Leave everything unplugged when you turn your Mac back on.

Same problem today to my MacBook Pro (Retina, 13-inch, Early 2015). Tried completely-shutting-down and both Bluetooth and lost device connections revived. One thing is that my trackpad has already been unpaired before the step but it just auto reconnected.

My 2015 MacBook Pro went into the Genius Bar today. They ran a hardware check, said I'd done everything they would of tried and said my only option now is to try a hardware replacement for the wifi/bluetooth card at £150.

They said that like "in the meantime until the next update" right? They can't suggest this like "we broke your BT hardware with our software update" and it's none repairable?! Unbelievable!

I have to carry my laptop to work since my iMac doesn't have any BT. I miss my TrackPad, Magic Mouse and connecting my AirPods! The iMac is now absolutely useless.

What actually is "this" that worked.

There are various fixes mentioned in this thread I have not yet found any of them to work (restore bluetooth) alone or in combination.

SMC reset (with varying off time) with/without devices connected

PRAM reset

revert to earlier OS (13.5.4).

Nonethless some seem to work in some cases (but there are also many who don't have the problem at all).

If there is a new thread with a solution please point to it.

I'm also getting this issue although for me it started with my Apple Bluetooth mouse dropping out which i thought was hardware issue at first and like you performed the reset at boot and profile deletion but it would keep coming back. But now after latest update all Bluetooth devices get dropped when i connect either my iPhone 8 or Ipad Pro and Bluetooth locks up and wont shut down so have to then perform a reboot to get devices back and now have to keep a wired mouse attached for rebooting once Keyboard and mouse disappear. I have reported this as a bug but it now seems it is more widespread and going back to earlier in the year the Mac never had this problem, so this issue has come about during the patching from march.

Not quite. If the 10.13.5 update upgraded the bluetooth firmware as part of the process, it is very likely that the rollback to 10.13.4 (or any other) didn't unroll that version of the firmware. And if the new firmware is where the bug is (just an assumption), they that would lead to exactly this.

well if a firmware update was applied then this can affect the bios and so cause issues in that it might not be possible to roll back to earlier as i remember years ago when everyone was having problems with the CD drive stop working in MacBook Pro after an update with myself included had to get new cd drives fitted as the firmware was corrupted on CD drive and no way to then roll back.

Last time i had bluetooth issue was Wednesday when I turned on my Nektar P6 midi controller/Keyboard (USB) and instead of it just connecting like usual I had the spinning colour wheel for a minute and when Midi keyboard finally connected both keyboard and mouse dropped out although this time it notified them dropping out onscreen and was able to stop start bluetooth and fingers crossed it's not actually done it again for the past few days.

Ok Bluetooth just failed again, I found an article on how to reset Bluetooth from the hidden debug menu (shift+Option then select bluetooth) afterwards turned on Audio interface (Presonus Studio 192, USB3) as this caused Bluetooth to crash late Saturday evening (yesterday) and all good followed by turning on my Midi Keyboard still good, so then attached my iPhone 8 and it connected still had bluetooth but noticed iPhone was not backing itself up so launched the menu within iTunes and performed manual Sync and as soon as that started Bluetooth devices disconnected and bluetooth was showing as unavailable. Had to reboot to get everything back.

I hope Apple developers work out what this issue is as my iMac is latest 2017 model and not even a year old but does still have hardware support so I might speak to them and let take a look and in that case i would delete my data for them to access it and if going to do that might just do a rebuild myself and see if issue goes away and if not then let them take it.

Article for Bluetooth Debug: http://osxdaily.com/2015/12/15/reset-bluetooth-hardware-module-mac-osx/