For the one or two that might read this post,
you might find this funny.
I struck out with imac. (do not have an iPhone)
Reformatted the fusion drive to the APFS system.
Guess what !! The Apple drive got broken.
Was going for a RESET of the OS and that failed.
Reformatted back to MAC Journal Extended and the system crashed.
The iMac 27" all-in-one cannot be opened.
Tried repairs using the "disk utility" but the "disk utility" said the drive was damaged.
Brought the device to an iMac repair shop.
The iMac repair shop's report was that the drive was unrepairable.
They told me it would need to be taken to another state for dispensation and replacement.
In 30 years, I never had this much trouble with a Microsoft device.
I quit. Sold the iMac to the repair shop.
Have returned to Windows
