Upgrading to macOS 27 Beta 3 damaged my Macintosh HD - Data Volume

**July 11, 2026 Updated: You don’t need to upgrade to 27.0 to fix the M5 Mac N1 wireless bridged problem, it is fixed in macOS 26.6 Beta! I have downgraded it to macOS 26.6 Beta 25G5057c and the UTM and VMWare can still work in bridged mode on a M5 Mac!**

Because there is a bug in the driver of Apple M5's N1 Wireless NIC macOS 26.x leading it failed to use bridged mode in any VMs or promiscuous mode in Wireshark, which is fixed in macOS 27 Beta, I upgraded to macOS 27 Beta 3 from macOS 26.5.2 to use the bridged Wi-Fi for UTM and VMWare Fusion on a M5 MacBook Air. After upgrading to macOS 27 Beta 3, I can use bridged Wi-Fi in the virtual machine.

​**However, I found that some of my files in my home directory cannot be opened. So I run the fsck command:**

sudo fsck\_apfs -n -l /dev/rdisk3s1

And here is the result:

\*\* The volume /dev/rdisk3s1 with UUID B5E265B1-EB7A-4200-935B-6BCDA9ADE23D was found to be corrupt and needs to be repaired.

​​​Now all my working data in \~/Documents are damaged after rebooting the computer. ~~I wonder whether the genius in Apple Genius Bar could recover my documents if I have a AppleCare+ subscription.~~ Luckily I found my lost file in my cloud backup. The problem was that I was in a Zoom meeting when the macOS App Library suddenly froze. After that, I couldn't open any apps, and a bunch of blank icons appeared in the status bar. After a while, my computer restarted, and then my files started to disappear.

Backing up your files before upgrading is really important, and I now realized that working with the Developer Beta operating system is risky.