I still have my N900 in a drawer, and I have zero interest to use it as a phone/pocket computer anymore. I really would like if it was possible to install Debia

I still have my N900 in a drawer, and I have zero interest to use it as a phone/pocket computer anymore. I really would like if it was possible to install Debian on it, and use it as a small headless network server. I remember this used to be possible to do in a very convoluted way, and only install to SD card. What is the best option for doing this today, is there an up to date guide somewhere?