Update/Upgrade Odroid C2 from 5.95 to version 19.11.4

Hi,

I want to update my version 5.95 to the latest current version

I get this error with apt update

Any idea?

Thanks for helping with this problem ...

apt update
Err:1 http://security.debian.org buster/updates InRelease
  403  Forbidden [IP: 199.232.16.204 80]
Err:2 http://apt.armbian.com buster InRelease
  403  Forbidden [IP: 193.40.103.96 80]
Err:3 http://repos.azulsystems.com/debian stable InRelease
  403  Forbidden [IP: 143.204.208.151 80]
Err:4 http://httpredir.debian.org/debian buster InRelease
  403  Forbidden [IP: 199.232.18.133 80]
Err:5 http://httpredir.debian.org/debian buster-updates InRelease
  403  Forbidden [IP: 199.232.18.133 80]
Err:6 http://httpredir.debian.org/debian buster-backports InRelease
  403  Forbidden [IP: 199.232.18.133 80]
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://security.debian.org buster/updates InRelease' is no longer signed.
E: Failed to fetch http://security.debian.org/dists/buster/updates/InRelease  403  Forbidden [IP: 199.232.16.204 80]
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://apt.armbian.com buster InRelease' is no longer signed.
E: Failed to fetch http://apt.armbian.com/dists/buster/InRelease  403  Forbidden [IP: 193.40.103.96 80]
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://repos.azulsystems.com/debian stable InRelease' is no longer signed.
E: Failed to fetch http://repos.azulsystems.com/debian/dists/stable/InRelease  403  Forbidden [IP: 143.204.208.151 80]
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

cat /etc/apt/sources.list
deb http://httpredir.debian.org/debian buster main contrib non-free
#deb-src http://httpredir.debian.org/debian buster main contrib non-free

deb http://httpredir.debian.org/debian buster-updates main contrib non-free
#deb-src http://httpredir.debian.org/debian buster-updates main contrib non-free

deb http://httpredir.debian.org/debian buster-backports main contrib non-free
#deb-src http://httpredir.debian.org/debian buster-backports main contrib non-free

deb http://security.debian.org/ buster/updates main contrib non-free
#deb-src http://security.debian.org/ buster/updates main contrib non-free