Any one else experienced this problem? Mac mini late 2018. Update went through, restarted Mac and now bricked. Will not turn on at all. Took it to Apple store and they say main board needs replacing at cost of 400usd.
any guidance?
Mac mini, macOS 10.15
None. This is a known problem for Macs with a T2 chip. See What to do when a T2 Mac suffers a problem updating its firmware. My understanding is you need to have the firmware re-flashed but I don't think that can be done, hence the need to put in a new motherboard.
I just finished writing an article about this, hope it helps you!
https://mrmacintosh.com/10-15-4-supplemental-update-bricking-small-number-of-t2-macs/
This article fixed the issue - fantastic! Despite trips to Apple Store (Hong Kong), where they wanted to charge me approx $400USD to replace the mother board - this article got it done in 10 minutes for free.
Thanks Apple.....
Thank you. Would think Apple Pay for that if it is a known problem?
Not unless you have a valid warranty that is still in force. It should get fixed in a new version of macOS.
Excellent article, ClassicII.
MacOS Catalina 10.15.4 supplementary update bricks macmini
