The issue is going to be the fact this is now an EOL device and the last firmware update was in 2019. Starting in 2020 there was a mass push to deprecate and get rid of anything under TLS1.1. Over the last two years they have introduced new algorithms and ciphers along with removing old versions of the same. In fact Let’s Encrypt just had an older CA pulled on Oct 31st that still had TLS1.1 and lower support.
So any device that hasn’t seen an update in the last two years that addresses this will not have the compatibility with newer certificates that are being issued. I have said this before but will keep saying this, using anything less than TLS1.2 is considered insecure. There are known exploits and issues with the older SSL/TLS versions that will not be touched in those versions. That means anyone can exploit those things.
I know there are some providers or others out there that are enabling/running older versions of OpenSSL so they have have TLS1.1 or lower support. While that placates to the users with older devices this will not be something that can be sustained long term as newer OpenSSL versions are removing that option and support. This means newer OS versions will not be able to support this.
So while there is this part of the road that you can still use older SSL/TLS it is not going to be a long stretch of road. That means people will need to make a choice, update to devices that support TLS1.2+, get into the non-TLS lane or pull off the road and never move forward again because it means losing support for older SSL/TLS.
Only one of those three options offers actual security.