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My 2017 iMac isn't working, its stuck on Windows.efi missing (i had bootcamp on here for a period of time) and it won't boot to MacOS, recovery mode, or boot selector. It goes straight to the windows error screen. This happened after deleting my Boot camp partition, trying to merge the now empty partition with MacOS and being met with an error which I responded to with a reboot.
If you have an Apple Magic Keyboard plug it into the iMac using the supplied charging cable or.. optionally plug in a generic USB keyboard and startup holding the Option-Command-R for Internet Recovery Mode.
see > Use macOS Recovery on an Intel-based Mac - Apple Support
Then completely erase the iMac's internal drive and reinstall the macOS.
see > Use Disk Utility to erase an Intel-based Mac - Apple Support
I've tried that, it still boots straight into windows.efi error screen, none of the key combinations I know will work
My guess is you need access to another Mac to create a USB bootable installer. That or perhaps taking it to an Apple Store where they may be willing to fix it.
Please help!! 2017 iMac is bricked, and I hope it's fixable
