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macOS High Sierra is a nightmare

I have a late 2012 iMac running smoothly for so long until I decided to upgrade to macOS High Sierra.

First, the upgrade failed. Just saying cannot install onto my Mac without much detail. Cannot rollback and therefore my external hard disk was stuck a non-bootable state.

Then I tried to restore my system to an empty disk using time machine and update it to High Sierra. Failed again and this time it ask me to use Apple AHT to test. I followed and found 4MEM error. Bingo, I thought. I rushed to replaced the RAM. Use AHT again and no more error. I thought I can continue the installation. So try again. But this time, still cannot install. Now it said OSStatus error 2.

Then I tried Internet recovery and downgraded the system to Mountain Lion. macOS can now boot into Finder. This time I try to upgrade directly from there. Again failed with OSStatus error 2.

My system is still not working yet and 4 days passed. What a waste of time! I never had such a bad experience with OS upgrade. This is simply the worst.

Have you any antivirus, cleaning or ANY third party maintenance apps installed on the computer?

I have a late 2011 version (i5, 8 GB RAM) running Sierra with zero problems. Did you update from Sierra to High Sierra and are you aware of the update to High Sierra just released? I don't feel I want to update to High Sierra until all the bugs are worked out..So sorry to hear of your problems

What type hard drive are you using for your backup? There are other discussion board posts from people using a WD hard drive who report that their issue was resolved when they read the special WD instructions for Time Machine users available at https://products.wdc.com/updates/docs/en/appletimemachine.pdf.

If applicable, when you get prompted for your password enter the following

User: wd_backup

Pass: backup

Not using WD but so far my time machine backup is fine. Restoring is good.

No such things installed.

最后更新：2017-10-06 17:50:31

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