Kobo Images

Hi everyone.

I'm very new to eReaders and don't know much about technology. Now, I have a few questions about images. Not as in pictures. As in, the, you know, device images the ones you burn onto a disk.

1. What exactly is an image?

2. When burning an image to your SD card, do you need to edit the serial number so it matches yours?

3. Where do I find my Kobo Mini serial number?

4. When and why would you need to replace an image?

5. The Mini comes with firmware version 2.X. If you replace an image with, let's say version 3.X and reset, will it go back to 2.X or reboot with whatever's in the SD card?

6. If I load an image with the previous owner's serial number onto my SD card, plug it into my Mini, and after it installs do a factory reset, will it go back to my SN or stay with the previous owner's SN?

7. I once bricked my Kobo Mini and used Kiwisaurus' Guide on How to Fix a Bricked Kobo eReader (https://www.mobileread.com/forums/sh...d.php?t=311227) to repair it. The last method did it for me (The "take out the SD card, download firmware and put it in the .kobo directory" one) and now I'm just wondering if I replaced the image or not. Are those two completely different things?