trs96
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Official Apple firmware updates are "bricking" some people's real Macs. We obviously don't need the firmware updates for our hacks. Read this first if you plan on upgrading your Mac to Catalina. So it won't become "Catatonic."
EFI firmware problem bricking some Macs on update to Catalina - 9to5Mac
https://9to5mac.com/2019/10/24/efi-firmware/
TL;DR If you have an older Mac i.e. 2012 - 2018 that is Catalina eligible, it may be best to wait till Apple fixes their firmware update before you upgrade the OS. There's no way all these failures happening after the update are just a coincidence. Apple is not fixing these Macs yet. Most are out of warranty. It sounds like those that do fix it via a 3rd party repair shop, replace the EFI firmware chip with a new good one or repair the existing one.
Here's one report from the Apple.com support forums.
Catalina bricked my MacBook Pro (Mid-2014, 128G)
I used macOS Mojave on mid-2014 MacBook Pro before update. While installing it forced me to restart. After restart nightmare has been started. The Blinking question mark folder has appeared on my screen.
I tried,
From the 9 to 5 Mac forum:
Catatonic - of or in an immobile or unresponsive stupor.
EFI firmware problem bricking some Macs on update to Catalina - 9to5Mac
https://9to5mac.com/2019/10/24/efi-firmware/
TL;DR If you have an older Mac i.e. 2012 - 2018 that is Catalina eligible, it may be best to wait till Apple fixes their firmware update before you upgrade the OS. There's no way all these failures happening after the update are just a coincidence. Apple is not fixing these Macs yet. Most are out of warranty. It sounds like those that do fix it via a 3rd party repair shop, replace the EFI firmware chip with a new good one or repair the existing one.
Here's one report from the Apple.com support forums.
Catalina bricked my MacBook Pro (Mid-2014, 128G)
I used macOS Mojave on mid-2014 MacBook Pro before update. While installing it forced me to restart. After restart nightmare has been started. The Blinking question mark folder has appeared on my screen.
I tried,
- Reset SMC and NVRAM (With all combinations these are find on internet and apple support page.)
- Access local and network recovery (with all key combinations)
- Access to time machine restore (with all key combinations)
- Mojave installation USB stick (that USB works we tried another Macs)
- External disk that includes pre installed Mojave (that external OS works well we ran on other Macs)
- Unplug all battery power (black reset)
From the 9 to 5 Mac forum:
My 27" 2013 iMac bricked in the process of installing the consumer release of Catalina. I was able to boot into recovery mode, but unable to reinstall the operating system. Wiped the disc clean, ran Disk Aid (healthy) and still unable to install. Apple Store was able to do a server install of Mojave, since the Genius assisting me confided that the ".0" release of Catalina was so buggy that he's telling everyone with ears to avoid it. Also said mine was the 7th issue he had that week.
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