Ok, starting in Fastboot Mode …
- Use the volume keys to select “Recovery mode” and press power to proceed.
- Recovery mode should start with a picture of an Android with an opened hatch and with the text “No Command”.
- In the menu there has to be a “factory reset” somewhere, that should be worth a try (even if it doesn’t do what the name implies, it just deletes Apps and user data, but sometimes it’s enough to get things going).
No, that would be on the computer.
We will need that if the factory reset proves to be not enough.
Which OS do you use on the computer … Windows/Linux/macOS?