Maybe not total idiot proof but I'm an idiot and have managed to follow this:

https://leste.maemo.org/Nokia_N900

Scroll down for installation guide. Download the latest image from here:


https://phoenix.maemo.org/job/leste-.../arm-sdk/dist/


I used Balena Etcher to get image to sdcard which is easiest way:


https://etcher.balena.io/


I followed the guide for working Fremantle. I will not go through flashing that.If you need guide for that, because maemo.wiki is down you find guide from here:


https://web.archive.org/web/20230125...g_the_firmware



After getting image on sdcard and you have Fremantle side ready, shutdown N900, boot (keep the lid/keyboard open and press the power button), with arrow key move on the menu that will appear to boot Maemo Leste.

Let it boot and even after you get to desktop give it some time.


Expand the space on your sdcard as in guide.Open xterm and:


cd /etc
sudo ./ expandcard.sh

I think after it has finished you could restart the phone and only after new boot start to do more.

Connect to your wifi.

Enable devel repository:
Open xterm.


Sudo apt update
Sudo apt-get install leafpad

Then:
sudo leafpad /etc/apt/sources.list

Add the devel repo on list:

deb https://maedevu.maemo.org/leste chimaera-devel main contrib non-free n900

Click menu/top bar and click save and close.

Sudo apt update
Sudo apt upgrade

Then to overclock install cpufrequtils:

Sudo apt update

Sudo apt-get install cpufrequtils

Then follow the guide on Leste wiki for overclocking. The path given on wiki may not be the same so you may need to find it by cd to /sys/devices/system/cpu/cpufreq/. I could not at first find the boost. But it was before installing cpufrequtils. Maybe now I could.

Enable swap as is described on instructions.

If someone sees I have given stupid instructions, please correct and give better. These are just to get started and to get the device overclocked and swap enabled so it will perform better while doing other configs.