MACBOOK and iphone connection problem

MacBookPro USB port flickers frequently after connecting iPhone via cable, but it’s actually due to computer voltage.
Open Terminal and type

sudo killall -STOP -c usbd

to shut down the process.
Plug in your iPhone and connect it normally, the problem is solved.
If it doesn’t work, change the cable.

Demote or erase a disk from a later version MACOS-Error degrading or erasing a disk from a higher version of MACOS: Incompatible disk This disk uses a feature that is not supported by this version of macOS
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