FYI: It is not closed on the Apple Support Community. It seems that Apple Engineers are investigating the situation. I had a similar/same situation happen to me when I upgraded my early 2008 MBP from Snow Leopard to Mavericks.a full moon bricked my mac. the dog bricked my mac. catalina ate my homework. a brick bricked my mac. etc...
FYI: It is not closed on the Apple Support Community. It seems that Apple Engineers are investigating the situation. I had a similar situation happen to me when I upgraded my early 2008 MBP from Snow Leopard to Mavericks.
Hello @Taz Mangus , and thanks for your kind reply!
Yes, I've seen a few guides online, including what gently suggested by @madrich, so yes, I'll be looking for some third party repair to see if they're willing to un-solder the EFI chip, I just hope I can find someone actually willing to do such a thing 🧐
What I'm curious about is also this: I've been said software can't affect hardware. But if an upgrade modifies my EFI configuration, being the thing literally soldered to the logic board, isn't this affecting the hardware?
I receive the solderless chip from macunlocks today, I manage to plug it onto the board and my boot like a charm. This is a chip that you plug onto a service port on the logic board.
ahah wow guys, you should be the actual Apple Care ! This is one of the best and proactive forums I've seen so far!
So, going with order, @Honza1 thank you for the extensive reply, I really think that explains the general issue with details! 👏
And thank you @Taz Mangus, that "solderless" solution looks even too easy to be real 🤩 I'm trying to debate with the Service Centre at the moment, but I will definitely consider this as a solution to try, since it's not that expensive afterall!
I'll come here for an update after the thing's resolved! Thank you again!
One of my partitions is a 10.15.6 system. Heh. I was close to updating it with the .7 when the brick bug reports started coming in! Dodged! I also keep a 10.13.6 system and the trusty old 10.6.8 system. I've been booted into 10.13.6 for day to day since just because. (Because there are random reports of this hitting in earlier versions including 10.14.) I'm an audio guy. I'm absolutely looking to Linux moving forward! There's no question there! All the pro apps are writing Linux versions now. Reaper DAW and video stuff like DaVinci.I doubt that you will ever see that from Apple. Enjoy staying on the OS that your on at present. Thats exactly what I did for Catalina 10.15.1. Or you can go the same path that I ended up doing which was to move away from Apple for business or critical use demands. Recently its safer to avoid the risk of updating a MAC than the hassle of some how managing to return one that is not working.