Bricked my MacBook Air?

[tamaralig]

Contact Apple Support, don't mention beta, You have a T2 chip, there's another way to boot your Mac. That -9000 error also sounds like it's not talking on the network to grab Internet Recovery. There should be a Terminal method to back into it. But if you went in and just deleted the Recovery section from Disk Utility, it's not for the faint at heart on all the steps to get it back. Most people tap out and take it to the GB. The steps for the T2 reset, are not on the website btw.

 

[DeanL]

https://discussions.apple.com/thread/250425419
You got the error because, at the moment, no internet recovery server is created by Apple for Catalina beta

It's not true tho. I upgraded to Catalina the day of release, then downgraded back to Mojave using Internet Recovery (and I have a 2019 MacBook Pro)...
T2 also has absolutely nothing to do with that.

EDIT: Here's what Apple says about reinstalling macOS from a beta:

Always back up your Mac computer before installing beta software. To get a public release of macOS on your Mac, you can simply install the final version of the software you are testing when it appears in the Mac App Store. If you need to go back to a previously released version, you must first erase the beta software, then re-install the latest public version of macOS, and finally restore from your Time Machine backup.

How to reinstall macOS

How to use Time Machine to back up or restore your Mac
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The instructions point to the same instructions I linked...

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[tamaralig]

It's not true tho. I upgraded to Catalina the day of release, then downgraded back to Mojave using Internet Recovery (and I have a 2019 MacBook Pro)...
T2 also has absolutely nothing to do with that.

EDIT: Here's what Apple says about reinstalling macOS from a beta:

Always back up your Mac computer before installing beta software. To get a public release of macOS on your Mac, you can simply install the final version of the software you are testing when it appears in the Mac App Store. If you need to go back to a previously released version, you must first erase the beta software, then re-install the latest public version of macOS, and finally restore from your Time Machine backup.

How to reinstall macOS

How to use Time Machine to back up or restore your Mac
​

The instructions point to the same instructions I linked...

​

​

But he doesn't recall what part of his drive space he deleted in Disk Utility and after a reboot, that -9000F error started. With a T2 chip, it will act bricked if certain steps aren't taken to ensure the recovery partition is left in tact. Trust me when I say, there's some added steps that he can contact Support and get into the Secured Enclave. He also couldn't restore from a bootable installer. There's also some steps for that that are T2 chip specific that are not posted online on the support site. You have to call, chat or bring it in to get access to those, if they were in the wild, anyone could erase someone else's newer Mac.