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