nx_corruption_detected_int:55: disk Container corruption detected by obi init :2779!

Thanks for the info!

The next step to take is to reinstall macOS, but to do this, you generally need 35.5GB of available storage. Since you only have 1 GB available, you'll need to erase your disk, then reinstall macOS. 

The first thing to do is backup as much data as possible. To do this, you'll need an external storage device. The SanDisk Professional 2TB G-Drive ArmorATD™ - Apple is a good option for you. It includes the legacy USB-C to USB-A cable needed to connect the external disk to your previous generation MacBook Air. 

Once you get the external disk, follow these steps:

1. Restart your Mac.
2. Immediately press and hold Option-Command-R until you see the startup screen.
3. In the Recovery app, select Disk Utility, then click Continue.
4. In the sidebar, select the volume you want to restore (the new G-DRIVE), then click the Restore button. This is the volume that is erased and becomes the exact copy.
5. Click the Restore pop-up menu, then choose "Macintosh HD - Data" in the pop-up menu. 
6. Click Restore, then click Done.

Your data is now backed up. You can verify using your 2019 MacBook. The external disk’s name should now match the name of your internal disk (usually Macintosh HD).

Now, you can erase the internal SSD, and reinstall macOS Big Sur. 

1. Select View > Show All Devices in Disk Utility.
2. Select "APPLE SSD..." in the sidebar of Disk Utility.
3. Click the Erase button in the toolbar, then enter the requested details:
   1. Name: Macintosh HD
   2. Format: APFS
   3. Scheme: GUID Partition Map
4. Click Erase. 

Then, quit Disk Utility, and select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions.

After reinstalling macOS, your Mac will open to a setup assistant. When asked how you want to transfer your information, select the option to transfer from a Mac, Time Machine backup, or startup disk. Then click Continue. Select your external disk, then click Continue. Continue to follow the steps to restore.

-Jack

Thanks for the added information.

It does sound like the installation of macOS on your disk has become damaged, or the internal disk has an issue.

It may be possible to install a copy of macOS to an external USB flash drive and see if you can access the internal disk and backup your data.

Let us know how it goes.

Jack

First off, First Aid will lie to users these days. Always click "Show Report" to manually scroll back through the report looking for any unfixed errors. In fact you should always run First Aid on the hidden Container in order to scan the complete APFS container since all APFS volumes within the container share the same file system. If there are any unfixed errors listed, then you will need to run First Aid while booted to Internet Recovery Mode, otherwise you will need to erase the drive before reinstalling macOS & restoring from backup. For an Intel Mac, I would erase the whole physical drive (do not erase the internal physical drive on an Apple Silicon Mac). Within Disk Utility you may need to click "View" and select "Show All Devices" before the physical drive and hidden Container appears on the left pane of Disk Utility.

With the 2018+ Macs, you can also perform a firmware "Restore" which will reset the security chip & firmware as well as erasing the entire internal SSD. Afterwards macOS may need to be reinstalled through Internet Recovery Mode if the process does not push a new OS to the internal SSD. This process does require access to another Mac running macOS 12.4+.

Revive or restore an Intel-based Mac using Apple Configurator - Apple Support

If Internet Recovery Mode doesn't work, then you could also use a bootable macOS USB installer if you have access to another compatible Qualifying Mac.

Create a bootable installer for macOS - Apple Support

Edit: You will want to use the same or newer version of macOS so that Disk Utility is compatible with the version of the file system on that Mac.

Hi there!

I'd like to ask a few questions to understand your situation and how to proceed.

1. Do you know what version of macOS you were using?
2. Do you have access to another Mac? If so, what's the model?
3. Do you have an external storage device?

Thanks in advance!

-Jack

Thanks for the info!

Have you tried starting up in safe mode? Safe mode can help you to determine whether an issue is caused by software that loads as your Mac starts up.

How to use safe mode on your Mac - Apple Support

Jack