Hi apogio,
a translation
of your tutorial to Naija language has been
made of your tutorialposted and I commented there to add the detail that after making changes to the
/boot/config.txt
file usually the Raspi needs a reboot to apply those changes to take effect.
Maybe you add this detail for Raspi newbies, too?
See here:
https://bitcointalk.org/index.php?topic=5399898.msg65346544#msg65346544