my device - Mac mini m4
[Edited by Moderator]
Mac mini
You can try a DFU Firmware Revive, but I'm guessing you will need to go with the nuclear option of a DFU Firmware Restore. Unfortunately this option requires access to another Mac running macOS 26 Tahoe......macOS 15.x Sequoia may also be an option as well, not sure about the latter though
How to revive or restore Mac firmware - Apple Support
You can try a DFU Firmware Revive, but I'm guessing you will need to go with the nuclear option of a DFU Firmware Restore. Unfortunately this option requires access to another Mac running macOS 26 Tahoe......macOS 15.x Sequoia may also be an option as well, not sure about the latter though
How to revive or restore Mac firmware - Apple Support
That error usually means the internal SSD’s partition map got misconfigured during formatting or macOS isn’t detecting the correct APFS container.
Here’s what I’d do: boot into Recovery (hold power until “Loading startup options”), open Disk Utility, choose View > Show All Devices, and erase the entire internal drive (not just “Macintosh HD”) as APFS (GUID Partition Map). Then reinstall macOS directly from Recovery without connecting any external drive.
If it still loops, reset NVRAM and run Apple Diagnostics, it’ll confirm if there’s a firmware or hardware issue with the M4’s internal storage.
Got into the loop of ‘ Manually Reformatted Disk Detected’ Any help here?
