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Mac mini Late 2020: AC2 "Unexpected device state 'DFU' expected 'RestoreOS'" Error 4014

Mon, 18 May 2026 15:16:13 -0700

My mac mini has sadly been rendered unbootable after a power surge. It will chime and immediately turns to an SOS blinking amber light.

As a disclaimer, I know this may be a hardware issue and that is why I am here. I have already taken it to Apple and they had no luck, telling me it needs a logic board replacement. It wasn't worth the money so this has turned into just a slow learning project that I've been chipping away at as a hobby.

I have tried to restore it with Apple Configurator and another MacBook, but after putting it into DFU mode and waiting for it to restore, it fails with this error (4014)

Unexpected device state 'DFU' expected 'RestoreOS' (Probably forced into DFU mode externally)

AC recognizes the Mac Mini, and the restore works up until Step 4/4, "Installing System", where it pauses halfway and then gives that error.

At that point I can see via the status light on the Mac Mini that it goes from a normal boot (white) to DFU mode again (solid amber) randomly, and AC sort of flickers at this point as well and then complains about the Mac Mini being in DFU (instead of RestoreOS).

I guess this could be something fried on the board, but I wouldn't know where to start because the only apparent issue being that it just randomly dips out of RestoreOS and back to DFU is very odd.

I've heard this error (4014) can be a faulty cable, but I've tried a lot of different ones, including a genuine Apple USB-C cable. I may buy a brand new one and try again.

Do you know of any software or hardware issues this could be? It seems like a simple issue but with no real rhyme or reason to it. Even if you just have a hunch, any tips on where I should look next would be greatly appreciated.

⟐ Answer accepted May 18, 2026 at 15:16 MST

Shark Rotator Lift-Away Speed: Wand Release button doesn't work.

Mon, 18 May 2026 15:13:32 -0700

We have had three Shark Rotator Lift Away Speed (not powered) vacuums all fail in the same way. The wand release button stops working, and the wand cannot be taken out. We have returned the first two to Target, and are hoping there is an alternative to keep returning them.

⟐ Commented May 18, 2026 at 15:13 MST

Kenmore Elite HE3 Washing Machine: What does CL mean

Mon, 18 May 2026 15:11:19 -0700

My washer flashes CL when I power on. Will not let me choose cycle and will not start

⟐ Commented May 18, 2026 at 15:11 MST

Microsoft Surface Pro 7: Still not powering on after battery replacement

Mon, 18 May 2026 15:05:45 -0700

I replaced the battery on my surface pro 7 and before the swap, The charger would double blink indefinitely until it was disconnected, After the battery replacement it blinks 1 - 2 - 2/3 -2 and then stops until I press the power button again, Both before and after the replacement there is a red light that stays on solid on the motherboard next to the SSD, The red light only goes out when I disconnect the battery or have the surface connected to the adapter only, I tried button combos to no avail, The display just stays off and the fan doesn't move either. I also tried multiple different adapters and USB-C charging at 65w.

2016-2018 Audi A6: How can change the oil

Mon, 18 May 2026 14:59:21 -0700

How we can change the oil

⟐ Answered May 18, 2026 at 14:59 MST

2005-2015 Toyota Tacoma: How to lubricate gear shift linkage?

Mon, 18 May 2026 14:55:22 -0700

How to lubricate gear shift linkage?

HP Pavilion x360 13-s000ur: Operating system trouble shoot

Mon, 18 May 2026 14:25:24 -0700

When my computer powers up it turns on but the operating system is inoperable . How do I get the system to operating status?

2008-2013 Nissan Altima: Why is my gas pump not pumping

Mon, 18 May 2026 14:21:13 -0700

vent Control valve replaced

⟐ Commented May 18, 2026 at 14:21 MST

MacBook Pro 15" Touch Bar 2018: Touchbar stopped working and a fuse burned?

Mon, 18 May 2026 14:19:38 -0700

I am an amateur so bear with me. I started trying to repair this Macbook Pro some time ago. Its my own.

Today I disconnected and connected the motherboard due to some work in the power button / touch id (There is another post related to this.

So, that is a short summary and what happened now is that when I reassembled the computer and turned it on I notices that the touch bar was not showing anything so I turned off the computer and looked inside to have a look at a connector on a cable that I messed up a year ago (Sadly I was not as careful back..). While examining the cable and connector and touching it I noticed some smoke(?).. I thought that I imagined it.. Then I see sparks and a tiny fire! I rush to disconnect the cable from the connector and disconnect the battery..

Here I am now, with two questions:

Where does the touch bar get its power from? I cant figure it out by myself.
What is this connector that I messed up used for and did I burn a fuse on the MB? How should I proceed?

⟐ Commented May 18, 2026 at 14:19 MST

HP ProBook 430 G4: Why does the laptop has issues with ROM

Mon, 18 May 2026 14:19:18 -0700

I run a check on the bugs bit now my laptop needs configurations

⟐ Commented May 18, 2026 at 14:19 MST

UPS: 20kva UPS having a red battery fault

Mon, 18 May 2026 14:17:29 -0700

We just changed the ups battery and upgraded with 12v 100 ah led acid battery now the ups has a battery fault

⟐ Commented May 18, 2026 at 14:17 MST

2011 Mitsubishi Galant: Why is my car turning over really fast when I crank it try to crank it

Mon, 18 May 2026 14:15:37 -0700

cranking problems

⟐ Commented May 18, 2026 at 14:15 MST

iMac G3 Model M5521: iMac G3 Slot-Loader chimes, then turns off.

Mon, 18 May 2026 13:52:39 -0700

Back in January I got this iMac G3 for pretty cheap. It originally powered on but showed nothing on the CRT.

When I connected an external VGA monitor, I saw it did boot to the “No boot device” screen, which was expected since the original HDD was removed due to failure.

Eventually a MacOS install CD got stuck, so I opened it up and removed it manually. After that, the behavior changed. It now chimes with the green power LED, then as the external monitor briefly detects a signal, it shuts off.

If I try again right after, the power LED comes on but nothing else happens. No chime, no video, nothing until I power it off manually. After unplugging for a few seconds and plugging back in, it goes back to the initial state where it chimes and then shuts off when it should show video on both CRT and external display.

What can I do? I replaced the PRAM battery and it made no difference. It also shuts off before I can do a PRAM reset (Opt+Cmd+P+R), and the physical PRAM button hasn’t helped either.

Trickle voltages seem normal, but when it reaches the “power LED only” state, the down-converter board trickle voltages are lower than normal.

I can also hear the high-voltage crackling as it powers off, so I assume the CRT is receiving power in some way. One other thing of note is that either the speakers, or the down converter board make a high pitched sound, I'll attempt to identify the source later today.

⟐ Commented May 18, 2026 at 13:52 MST

MiJia QiCycle Folding Electric Bike: power disconnecting when hitting a bump

Mon, 18 May 2026 13:43:14 -0700

my screen/power goes completely off when riding and hitting a bump. I need to push back a little bit the battery to the front to be able to power on again.

it started some time ago but latelly is so often that I need to do it every time I face any crack or object on the road. Usually a little push on the back side of the battery (red light) is enough to power on again, but after just a minute if the road is bumpy it goes off again.

I suspect is related to connections between controller and battery, and I will tear it down if I need, but I wanted to know if someone is having the same problem.

this is NOT the same as losing assistance, that's another unrelated problem. my screen goes off completely, not just the assistance.

I didn't find anyone complaining about this so please, contact me if you're facing the same issue.

muzzol@gmail.com

EDIT: I found a video describing a very similar situation

https://www.youtube.com/watch?v=IRyQtrLo...

unfortunately the guy just returned the bike, so no real solution for us.

⟐ Commented May 18, 2026 at 13:43 MST

DualShock 3: The D-pad Down button has stopped working on my PS3 Controller.

Mon, 18 May 2026 13:42:44 -0700

I've been playing my PS3 a little bit, not loads, with several months passing inbetween playing on it. However, recently the dualshock 3 controller D-pad has partially stopped working. Specifically the down button on the D-pad no longer works. The rest of the D-Pad works fine.

Anyone know what the problem could be and how I could possibly fix it?

Cheers

⟐ Edited by author May 18, 2026 at 13:42 MST

Canon EOS 30D: Pourquoi le flash ne fonctione pas

Mon, 18 May 2026 13:30:12 -0700

Flash ne fonctionne pas

Galaxy S23 Ultra: SIm 1 is not working

Mon, 18 May 2026 12:47:42 -0700

I have utilized this device without incident for an extended period. Unexpectedly, my network access was suspended, and the device displayed "emergency calls." Subsequently, an error indicated that SIM 1 not allowed

Jbl tuner 2: JBL tuner dab/fm is Frozen

Mon, 18 May 2026 12:42:41 -0700

I tried to do a factory reset on my JBL tuner. I plugged into my acer chromebook. Everything was going fine until I was going to eject. I must have clicked in the wrong place , because the usb connection dropped. Now the display shows : " No update file" My speaker will not respond in anyway, regardless of which codes I try. Also it will no longer connect by usb.

⟐ Commented May 18, 2026 at 12:42 MST

Google Pixel Watch 4: Band keeps popping off. Little button is gone. Can this be fixed?

Mon, 18 May 2026 12:34:41 -0700

Band keeps popping off. The little button is gone. Can this be fixed?

Windows 11: Browser keeps going back a page

Mon, 18 May 2026 12:02:17 -0700

I am not sure if anyone can help with this, but thought I'd check here anyway. I have been trying to find a cause for this issue for months and have found no solutions whatsoever.

This has happened in both Chrome and Edge, so I know it must be a Windows issue. So, when I am in my browser, and I am doing work, being productive, without any clear cause, the browser page will revert back to the previous page. In some of the work I do, this results in lost work and having to start over which is highly annoying and results in a lot of wasted time and aggravation.

It does not have anything to do with my mouse or keyboard, as both of those have been replaced and it has not solved the issue. There are no keyboard hotkeys assigned to move the browser page forward or back. I don't use the touchpad but no gesture settings are assigned to perform this function. I am at my wit's end and am seriously considering switching my whole set up to my Mac mini, which would be a hassle but I am so tired of this happening with no fix or useable advice.

I have searched the internet many times for a solution, and this seems to have been an ongoing issue with Windows on different PCs for a long time from what I can see, so I am hesitant to say that it is only an issue with my specific computer.

Has this happened to anyone else, and did you ever find a solution? The most advised solution from any kind of support has been to do a clean Windows install which seems like a huge deal with no guarantee of a fix.

⟐ Commented May 18, 2026 at 12:02 MST