Updating the Satellite radio

I let the subscription slide 7 years ago on my 2012 after the 3 free months. This month Sirius offered me two more free months, and since no cc was required I took it. A lot more channels out there now. In fact more than twice as many. Unfortunately, the channel numbers tunable in my 2012 top out at #235, and there are many in the new lineup in the 300s, 400s, and 700s.

After looking at the Sirius site I could not find any firmware updates for car manufacturer installations. Anyone else been through this and found a solution? Is it a Toyota issue or am I looking at an aftermarket head unit to get the additional channel numbers?