u/Exciting-Driver1603

I own a 2017 iMac and have been using it for about four years. Recently, because some apps were not available or compatible with macOS, I decided to install Windows (since it’s an Intel model). However, the installation ended with an error, and now I am stuck on a blue screen that says, “Insert a USB drive.”

I tried switching back to macOS, but I had previously enabled a firmware password and now cannot access the boot options. As a result, I am completely stuck on the blue screen.

Is there any way to fix this? (I believe the firmware password is Apple’s default one.)