Downgrading OS.....

[Ifti]

Upgraded my 2019 MBP (i9/32GB/1TB) to Monetary.
Although everything works, I find FCPX has slowed right down. Editing is OK, but opening events and projects takes ages - it was fine with Big Sur. Hence I am considering downgrading back to Big Sur.

Please confirm if the below process is all it takes?

- Download and create a Big Sur install USB
- Boot into recovery and switch on booting from external drives (I have the T2 chip)
- Wipe drive and install Big Sur
- Restore/migrate all applications, data and settings from my most recent Time Machine Backup.

Is that correct?
Does it matter that my TM backup is from Monterey?

 

[Fishrrman]

"Does it matter that my TM backup is from Monterey?"

It might.
Unfortunately, you won't know unless you've tried it.
You may install BS and then find that setup assistant won't migrate your data because your backup is "too new".

Do you happen to have another spare drive around?
I would suggest you create A SECOND BACKUP.
Download the MOST RECENT VERSION of CarbonCopyCloner and create a cloned backup.
CCC is FREE TO USE FOR 30 DAYS, doing this will cost you nothing.
Carbon Copy Cloner - Download

CCC now has some kind of feature that (I think) might be able to help you "go back" -- in other words, that lets setup assistant or migration assistant use a backup that was created with a newer version of the OS (than the one you're trying to "go back to").
I don't know anything more about this than to say that it's worth investigating further.

Something else:
When you boot from the bootable USB installer, go to disk utility and do this:
Go to the view menu.
Choose "show all devices".
Now you can select "the top line on the left" that represents the physical drive, and COMPLETELY ERASE it.

 

[Ifti]

Thanks - I forgot I had a CCC clone that I made just before upgrading to Monterey.
I ended up booting into that clone and restoring it - had to do a BS update to the latest version, but now back to running BS, and my issue of FCPx running slow has been resolved!

However, now I have a new issue Ive never had before......
Everything is working fine, but the Notes app crashes a few seconds after opening and closes itself. Never had this before......

Any ideas?

Extract from Crash report:

Process: Notes [798]
Path: /System/Applications/Notes.app/Contents/MacOS/Notes
Identifier: com.apple.Notes
Version: 4.8.1 (1872)
Build Info: Notes-1872000000000000~168
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Notes [798]
User ID: 501

Date/Time: 2021-11-14 19:06:09.765 +0000
OS Version: macOS 11.6.1 (20G224)
Report Version: 12
Bridge OS Version: 6.0 (19P548)
Anonymous UUID: AAE14E81-9C58-42F8-353A-75882DE0252B

Sleep/Wake UUID: B6244552-7A23-4498-9CBD-DBA101587E43

Time Awake Since Boot: 520 seconds
Time Since Wake: 290 seconds

System Integrity Protection: enabled

Crashed Thread: 4 Dispatch queue: NSManagedObjectContext 0x6000024da490

Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: exc handler [798]

Application Specific Information:
dyld3 mode

 

[appltech]

Upgraded my 2019 MBP (i9/32GB/1TB) to Monetary.
Although everything works, I find FCPX has slowed right down. Editing is OK, but opening events and projects takes ages - it was fine with Big Sur. Hence I am considering downgrading back to Big Sur.

Please confirm if the below process is all it takes?

- Download and create a Big Sur install USB
- Boot into recovery and switch on booting from external drives (I have the T2 chip)
- Wipe drive and install Big Sur
- Restore/migrate all applications, data and settings from my most recent Time Machine Backup.

Is that correct?
Does it matter that my TM backup is from Monterey?

Hi! Steps you highlighted should be good enough, though you may need more details on that. As for restoring from Time Machine backup, i didn't have any problems with restoring from newer system. Apparently it restores apps, passwords, data only, and you can't restore/downgrade the OS even when launched from Recovery Mode->Restore from Time Machine