)ĭuring the boot process, I reconnected this I/O Board and during the Clean Install with USB Stick of Big Sur during the restart of the install, the MBPr restarts without a black screen. HDMI Chip should be the problem I dunno (Source. Well, I have the same with my MBPr 2014 Mid 13” I got an USB clean install, to boot disconnect the I/O board and others say you have to order a new one. Once done disconnect the battery again and reconnect the I/O cable and battery you should be set at this point. Reconnect the battery and restart the install process. Repeat the task on the other side fully removing the cable. Here's the guide MacBook Pro 13" Retina Display Mid 2014 I/O Board Replacement Follow it to Step 6 then jump down to Step 17 & 18. So as you are in no mans-land with a useless Mac you'll need to either fix the issue your self or find someone with the needed skills to do it for you. They should still get the information out to their geniuses & repair depots. I can understand they would prefer to do this via software (OS installer) which hopefully they address in the maintenance release soon.
#UNABLE TO UPDATE TO MACOS BIG SUR HOW TO#
For some reason after the OS install is competed you can then reconnect the I/O board.Īpple is aware of the issue, it appears they want to play dumb! As we have told them how to fix this physically. To correct this you need to disconnect the I/O board cable and re-run the OS installer. Once attempts it writes to it the installer won't finish. Issue stemmed from when macOS decided to download Big Sur & Catalina supplementary - I can report the issue is a programing issue within Big Sur's installer updating the HDMI chipset firmware. However, it is not recognized when I boot the system when I hold the Option key.Ībout to throw the laptop into a trash can out of frustration for what was supposed to be a good update. I don't own another Mac and used TransMac to make a bootable macOS Sierra install drive. Then, Disk Utilities First Aid worked and let me Restore the drive, but every time I try to update via the internet it just fails. I couldn't delete them until I rebooted and triggered the Big Sur internet recovery OS by holding Option, Command, and R keys. I used find my iPhone to wipe the MacBook entirely and that triggered internet recovery mode which showed the drive had been split into three partitions. I tried to get into recovery OS but couldn't even unlock the FileVault using my Apple ID correctly because of corruption. The update to Big Sur from Catalina completely failed mid-cycle and bricked my MacBook Pro that originally had Sierra on it.
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