Welcome to the community!
We'd love to help request a firmware upgrade for your modem/router. We tried to use your community details to pull up the account unfortunately it does not show any matching records.
We'd like to get your account details (Username/Customer ID together with the address on file).
In case you need a reference: How do I private message (PM) in the community
Thanks for providing your account details via PM. We have already requested for a firmware upgrade. We'll let you know once it's done. Please keep an eye on this thread.
As for the DDNS setup, do you have a DDNS account already?