How to upgrade an EOL FreeBSD release or how to make it working again

Hello to everyone.

I'm trying to install FreeBSD 14 natively on my ARM Chromebook model
xe303c12 ; I've found only one tutorial that teaches how to do that,that's
it :

https://wiki.freebsd.org/arm/Chromebook

The problem is that it ends with the installation of FreeBSD 11,that's very
EOL.
I can't use it as is. I need to upgrade it to 14 (but I'm on arm 32
bit,that's TIER-2,so I can't upgrade it automatically using the
freebsd-update script. It is also true that I can't install 14 directly on
that machine,as you can read below :


[image: unnamed.png]

I've looked all around and I found the tool pkgbase,that I'm talking about
on the FreeBSD forum,to understand if it allows the 11 to be usable or
upgradable. It does not seem to be the proper tool to achieve my goal. Do
you have any suggestions that can help me ? Thanks.

-- 
Mario.