macOS Won’t Boot: “Macintosh HD - Data” and “Update” Disks Appearing

Hello,

I’m facing an issue with my Mac where macOS no longer boots. Upon checking in Disk Utility, I see the following:

1. Macintosh HD - Data: This volume appears below the usual Container disk2

2. Update: A partition labeled “Update” has appeared, which I’ve never seen before.

Here’s what happened:

• My Mac was performing a macOS update, but something seems to have gone wrong during the process.

• After restarting, macOS no longer boots, and I’m stuck.

I’ve tried the following so far:

• Booting into macOS Recovery and running First Aid on both Macintosh HD and Macintosh HD - Data. First Aid completed without any reported errors.

• Restarting in Safe Mode, but the system still doesn’t boot.

• Checking Disk Utility, where I noticed this mysterious “Update” partition, which I assume might have been created during the failed update process.

I’d appreciate guidance on how to:

1. Remove the “Update” partition safely.

2. Restore macOS to boot properly without losing the data on Macintosh HD - Data.

See screenshot attached.

Thanks in advance for any advice!