We’ve done this, and it’s surprisingly easy. You’ll need way to connect the MicroSD card to your computer, so either a USB reader or SD to MicroSD adapter. Make sure you have such a thing first. They come with every GoPro or sport camera, and often come with MicroSD cards themselves, and can be had from Amazon for a few dollars.
What I’m thinking is that if you copied the files over to the E2, but didn’t “unmount” or “eject” the card from the computer before powering off the E2, it’s possible that the files were corrupted. Windows occasionally does things like virus scanning, file indexing, or things like that to be “helpful”. If it was in the middle of an operation like that when the power was turned off, it’s possible for a file to corrupt. If the E2 attempted to boot from such a corrupted file, it would be Bad™. But it is straightforward to fix, albeit inconvenient.