Debian (Orange Pi Zero) unable to update or upgrade

Witenite

Hi,
I have downloaded the latest Debian version (as at 10/02/2018) from Orange Pi, and installed it and have it up and running on my Orange Pi Zero (H2+) board. I see though that it appears to be quite old (last updated late 2016). When I try to run sudo apt-get update and sudo apt-get upgrade, the firmware fails to upgrade, and I get the following warnings:

W: Ignoring Provides line with DepCompareOp for package libapt-inst
W: Ignoring Provides line with DepCompareOp for package libapt-pkg
W: Ignoring Provides line with DepCompareOp for package libespeak-dev
W: Ignoring Provides line with DepCompareOp for package libespeak1
W: Ignoring Provides line with DepCompareOp for package libgpgme11-dev
W: Ignoring Provides line with DepCompareOp for package kodi-api-guilib
W: Ignoring Provides line with DepCompareOp for package kodi-api-pvr
W: Ignoring Provides line with DepCompareOp for package libparse-cpan-meta-perl
W: Ignoring Provides line with DepCompareOp for package libjpeg62
W: Ignoring Provides line with DepCompareOp for package lsb
W: Ignoring Provides line with DepCompareOp for package lsb-core
W: Ignoring Provides line with DepCompareOp for package php-psr-log-implementation
W: Ignoring Provides line with DepCompareOp for package php-seclib
W: Ignoring Provides line with DepCompareOp for package php-sabre-http
W: Ignoring Provides line with DepCompareOp for package php-math-biginteger
W: Ignoring Provides line with DepCompareOp for package pkg-config
W: Ignoring Provides line with DepCompareOp for package pypy-cffi
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package sagenb-export
W: Ignoring Provides line with DepCompareOp for package sagenb-export
W: You may want to run apt-get update to correct these problems

Note the last line states I should run apt-get update, but that's exactly what I have just done! Reading online it appears the security keys may be out of date for this version. As such, it is unable to update itself.
I need to run an update so I can also install curl, but again, when I try to install curl, I get the same errors seen above. This more or less renders Debian a useless alternative as an OS for the Orange Pi Zero, as I cannot work with such a dated system. How do we go about updating Debian?

Regards,
Graham