I followed this tutorial to install Windows 10 on external drive.
I followed it until step 7, then I quit and restart the MacBook but now it doesn’t boot in macOS. I disconnected the external drive and restored the original boot settings. When I turn it on, it keeps restarting on its own after displaying the Apple logo and making the sound.
What can I do? Any advice is welcome. In the worst case, I'm asking for advice on how to recover data from the internal hard drive and then reinstall macOS.
