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yas0501 Author

Level 1

4 points

MacBook Pro has a reboot loop at startup

Probably due to my own actions, I can no longer boot macOS.

I would like to get it back to the original state so that I can boot it if possible, but I believe that I will have to do a clean install at worst.

The following is a description of the situation, etc.

Situation

I get a reboot loop when starting mac and cannot log in.

Cannot enter safe mode, but can boot in recovery mode.

Behavior that may be the cause

Enter the following command in my terminal

mkdir ~/mount
sudo mount -o no browse -t apfs /dev/disk1s1 ~/mount
sudo kmutil install -volume-root ~/mount --update-all

Enter the following command, but it fails

sudo bless --folder ~/mount/System/Library/CoreServices --bootefi --create-snapshot

Error message in that case (presumably)

Couldn't create snapshot on volume /Users/[me]/mount: Operation not permitted

After that, I restarted macOS as it was, and it started looping, leading to the current situation.

Device information, etc.

Device : MacBook Pro 16″

Version : macOS 11.5.2

Screen confirmed by Disk Utility in Recovery Mode

Please note that the text in the image is in Japanese since I am Japanese.

MacBook Pro 16″, macOS 11.5

Posted on Apr 30, 2022 9:29 PM

Top-ranking reply

TheLittles

Level 10

196,347 points

Posted on Apr 30, 2022 9:39 PM

yas0501 Said:

"MacBook Pro has a reboot loop at startup: Probably due to my own actions, I can no longer boot macOS. I would like to get it back to the original state so that I can boot it if possible, but I believe that I will have to do a clean install at worst. The following is a description of the situation, etc.[...]"

-------

Troubleshooting a Mac in a Boot Loop:

Is this consistent? If so, it seems you are in a boot loop. So, refer to the following...

I. Boot in Safe Mode:

In Safe Mode, Login Items do not run at login, certain preferences are set aside, and damaged system files are then reset. So, once booted in to Safe Mode, wait 30 seconds, and then boot up normally, attempting another update install. For instructions, go here: How to Use Safe Mode on your Mac - Apple Support

II. Reset your SMC and your NVRAM:

(Applies to Intel-Basel Macs Only) Sometimes changes (i.e. Installations) are made to the system and then settings (i.e. Networking) become corrupted, technically. So, reset both on your Mac. So, reset the SMC and reset the NVRAM or PRAM. It might take three tries. to fix this. So, be certain you have the time to do so.

Start With This:

III. Re-Mount the Drive:

Boot into Recovery Mode (Intel or Silicon) . You need to click the “Mount’ button to proceed. So, select the drives, and then click "Mount" Try rebooting once more. If of no success, then click unmount button, and then the mount button. Try rebooting once more. It looks dulled-out. So, if you cannot click it, then click the First Aid button to fix this volume.

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MacBook Pro has a reboot loop at startup

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