I bought a orangepi 3 LTS and put it in a case and got a little fan to work via GPIO and got my image in a SD for the first boot. I turn it on and it has android OS v9 on it. I want to run Debian on it for some personal projects as I want to get familiar with Linux environments.
Should I be concerned it has an Os on it when I thought it was new? I have put it on my home network or connected it to anything at all.
How would I go about removing android and booting from SSD to use Debian?
Edit: I looked up the wiki and found it comes with android to test the hardware. All good
Don't know where you got your card from and whether it was supposed to have a "demo" os. If it came with the board, it's understandable it would just boot to show the board works.
Also don't know if that opi could have other boot rom on it. That should be in the specs.
But you should be easily able to flash what you want on the card and use that. If you want to go more paranoid route, get a fresh card by a known good manufacturer from a trusted store and start from there.