iPhone 15 with IOS 17.2.1 when plugged into iMac with macOS Monterey, comes up with message a software update is required to connect to DFU device.
What version of macOS do i need?
iMac 21.5″, macOS 12.7
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Please re-post with detail so that someone else can help.
The latest version of macOS that your iMac (21.5-inch, 2017) can be updated to is macOS Ventura 13.x.
The message "a software update is required to connect to DFU device" typically indicates that your Mac needs to be updated to ensure compatibility with your iPhone 15 running iOS 17.2.1.
iPhone 15 will not synch without software upgrade
