My only suggestion is to use safe more to copy the backups to another disk.
I wish the best of luck.
I wish the best of luck.
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Big Sur won’t boot
- Thread starter Sketchmac
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I had the same problem, it was a KEXT that was causing the boot to fail, for me it was the 3DConnexion mouse Kext. My solution was
1. Boot into safe mode
2. Mount the data partition read write
3. Created a folder /Library/NoExtensions using the terminal
4. Moved all the Kext's to that folder from /Library/Extensions
Everything was fine after that. I logged a bug with the hardware manufacturer who said they will have a fix available by release time.
Hope that helps.
Bruce
1. Boot into safe mode
2. Mount the data partition read write
3. Created a folder /Library/NoExtensions using the terminal
4. Moved all the Kext's to that folder from /Library/Extensions
Everything was fine after that. I logged a bug with the hardware manufacturer who said they will have a fix available by release time.
Hope that helps.
Bruce
I spent many years doing software testing as a trade, so I have LOTS of experience in troubleshooting and reverse engineering software problems.
That said, my theory was that Apple had been warning every few weeks in Catalina that the hardware would stop working in a future version of the OS. So that was the main tip off...
So I'm trying to install Big Sur on a USB drive (two, to be precise) on a 2017 iMac (SIP disabled), and can't. I tried to follow these instructions, but I think I'm not sure how to do so when the Library folder in question is on an external drive...
Internal or external shouldn’t matter but if it APFS formatted there are two partitions. You need to mount the data partition read/write if you want to move the kernel extensions around, but if you are doing a clean install. You shouldn’t be having this issue.
You will need boot from external drives allowed in the T2 security settings, but if you are installing a valid Apple blessed OS you should be able to leave T2 enabled, although I haven’t tested it personally.
That's what I assumed. Here's what I'm doing:
- Boot to recovery
- Format USB drive APFS
- "Re-install macOS"
- It gets to the point where the OS is installed and it's going to reboot into the new install
- Boot progress bar gets to 100% and hangs
So I figured it out, I think. I'm not sure what I was doing wrong with the iMac, but that eventually worked. With the MacBook Pro (with T2), you can't boot Big Sur from an external volume if the latest OS installed on the machine's internal drive is Catalina or previous, because the T2 chip gets a firmware update along with Big Sur that makes it compatible/able to boot Big Sur. So I installed Big Sur on a small partition on the internal drive, which I think I can now delete, because I'm able to boot from the USB drive.
Actually, I also had trouble with the default kexts for Big Sur (it would boot and work for about 8 minutes, then suddenly the fans would blow really hard for a half-second and it would kernel panic. Moving all the kexts to a backup folder as Teknologika recommended seems to have done the trick.
Actually, I also had trouble with the default kexts for Big Sur (it would boot and work for about 8 minutes, then suddenly the fans would blow really hard for a half-second and it would kernel panic. Moving all the kexts to a backup folder as Teknologika recommended seems to have done the trick.
Having same problem but won’t go into safe mode. Hold shift, get file vault login screen, type password, then black screen. Keyboard and backlight along with touch bar work. MBP 2018 i9 with t2. I have a 3dconnexion mouse, but not sure how to delete that file without safe mode.
Themp, booting into recovery mode and using the terminal to move your kext files is the way (see Teknologika’s instructions above)
That’s what I ended up doing, but didn’t solve the problem. Installed it on a new partition, struggling with migration assistant now.