SamyGO

I have these two televisions that neither of them have usb to be able to update the firmware. I have obtained the service manual of both and it seems that two elements can be updated, on the one hand the firmware and on the other the software of the tdt part.
Has anyone been able to update the firmware of these models?
If so, what procedure have you followed?
I also can't find where to download the updated firmware.
From what I read, they received updates via OTA but cannot be downloaded from anywhere.

All the best.