Big Sur installation freeze after reboot


Joined
Nov 14, 2020
Messages
4
Reaction score
0
The installation starts and everything looks like it should!
Then the computer restarts and the Apple logo and a progress bar shows. It moves I little but then it freezes and nothing happens?!?
I left the computer on over night but it didn't move any more.

Then i have big problems to reach Recovery Mode to reinstall Catalina!
I have run the diagnostics but it found no errors in the system!

I have an iMac Retina 2017!
 
Ad

Advertisements

Cory Cooper

Moderator
Joined
May 19, 2004
Messages
8,874
Reaction score
341
Hello and welcome.

-Is it the 21.5" or 27" model?
-Do you have the original Apple RAM, or did you upgrade it with third-party DIMMs?
-How much free space is there?
-Do you have a current Time Machine or other backup of your data?

C
 
Joined
Nov 14, 2020
Messages
4
Reaction score
0
Hi, thanks!

It's the 27 and is all original!
There is lot's of space, of 1TB its around 600gb of space left so it shouldn't be any problem!
No haven't any Time Machine or other backup!

Im so confused about this. There haven't been any problems updating before and the computer works as it should!
This came with Big Sur! Catalina installs without any problems!
 
Joined
Nov 9, 2020
Messages
83
Reaction score
1
The installation starts and everything looks like it should!
Then the computer restarts and the Apple logo and a progress bar shows. It moves I little but then it freezes and nothing happens?!?
I left the computer on over night but it didn't move any more.

Then i have big problems to reach Recovery Mode to reinstall Catalina!
I have run the diagnostics but it found no errors in the system!

I have an iMac Retina 2017!
Sorry to hear that. On another Mac discussion site I visit, a number of folks there have also experienced issues with 1) downloading Big Sur, and 2) installing it. I refuse to take the plunge now. Will most likely start to test it, on a separate external SSD, after a couple of more versions come out. Besides, a number of my third party applications I use are not yet compatible with it.

As for recovery, what backup method/program do you use? If it's Time Machine, you might want to consider either SuperDuper! or Carbon Copy Cloner. Both of them work fine with Catalina, and both of them make bootable backups/clones. Makes recovery a lot easier.
 
Joined
Nov 14, 2020
Messages
4
Reaction score
0
Today i tried to install in safemode, but same result!
I really dont know where to get help with this....
 
Joined
Nov 9, 2020
Messages
83
Reaction score
1
It might be best to wait until a couple of more releases of Big Sur come out. Is there anything you must have in Big Sur? Myself, I see nothing.
 
Ad

Advertisements

Cory Cooper

Moderator
Joined
May 19, 2004
Messages
8,874
Reaction score
341
Hi,

You're in a tough situation, since you don't have a backup of your data.

Does your iMac have a Fusion Drive or flash storage?

Do you have access to another Mac? If so, you may be able to create a USB flash drive installer for Catalina, and install it on an exteranl drive that you can startup from. You may be able to recover your data that way. Or, you could try macOS Recovery and install try reinstalling Catalina: How to reinstall macOS from macOS Recovery > Command (⌘)-R.

It depends on what state the Mac is currently in, since the installation of Big Sur is failing.

C
 
Joined
Nov 9, 2020
Messages
83
Reaction score
1
Yeah, no backup is definitely dangerous! Have you been updating any of your machines to a new OS without having a backup? If you have, you have been lucky so far.

And Cory makes excellent points, and also excellent suggestions. Hopefully you can recover just about everything.

Going forward, it would be extremely wise to make frequent backups.
 
Joined
Nov 14, 2020
Messages
4
Reaction score
0
I have all my data in iCloud so that`s no problem.
Im back in Catalina now and everything workshop fine.

and i`ve tried to install Big Sur in a couple of ways but with the same error when it reboots!
 
Ad

Advertisements

Joined
Nov 9, 2020
Messages
83
Reaction score
1
Might be better to wait until a couple of more releases of Big Sur appear. On another site I visit, plenty of folks are having issues with it.

Also, what about third party software compatibility? You need to consider that. This site can help:

 
Last edited:

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Top