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vm2020

macrumors newbie
Original poster
Nov 6, 2021
3
1
Hello! I have a problem. I am using MacBook Pro 13 Mid 2017 (Two thunderbolt 3 ports) since 2018 without any problems. I was on Big Sur and decided to clear my MacBook. I rebooted into recovery mode, erased Apple SSD and tried to reinstall Big Sur. But it failed with error like "failed loading update" during installation. In logs there is error saying CRC missmatch. Since then I tried multiple times to create bootable stick with Mac OS installation using another MacBook. Every time I am trying to install Mac OS from stick I get same error in logs: CRC mismatch; got: %number% expected: %number% for file %filename%. I tried Big Sur and Monterey, same error for both. just different files and CRC checksums numbers. However when I create stick with Catalina I can install it successfully, but in logs I see that it also fails to verify CRC but after that it is not failing immediately and tries to retry and retry completes successfully. After that I am able to boot and use my MacBook without any problem but when I try to update to Monterey through system settings during installation I have the same CRC error.

I tried to reset NVRAM, PRAM, no success after reset. Is there something wrong with my MacBook hardware? Or maybe it is bricked firmware? Maybe there is a way to restore firmware on non T2 models? I saw that Apple suggests to restore firmware on T2 Macs using Apple Configurator, but I can not understand how I can restore Mac without T2 chip. Any help please? I can not go to official Apple service in my county right now because of lockdown.
 

Fishrrman

macrumors Penryn
Feb 20, 2009
29,233
13,298
"I rebooted into recovery mode, erased Apple SSD and tried to reinstall Big Sur."

Questions:
Did you reboot to the "recovery partition"
Command-R

or...

Did you reboot to "INTERNET recovery"
Command-OPTION-R

??
 

vm2020

macrumors newbie
Original poster
Nov 6, 2021
3
1
First time when I had working Big Sur and decided to erase it, I rebooted into "recovery partition". After first fail I tried INTERNET recovery and it failed with same error.
 

white7561

macrumors 6502a
Jun 28, 2016
934
386
World
I would always recommend to use a bootable USB installer to clean install etc. can you make a bootable USB installer? Also make sure to use the --downloadassets when making the bootable installer. It should download many firmware things so that when you install it. It doesn't need to download anymore. It might work
 

vm2020

macrumors newbie
Original poster
Nov 6, 2021
3
1
I would always recommend to use a bootable USB installer to clean install etc. can you make a bootable USB installer? Also make sure to use the --downloadassets when making the bootable installer. It should download many firmware things so that when you install it. It doesn't need to download anymore. It might work
I tried bootable USB installers with Big Sur and Monterey after installation from recovery failed. But I did not try --downloadassets flag. I will try it, thanks.
 
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