I'd be willing to bet that all modern TVs support local offline firmware updates. Whether the actual firmware update binaries are readily available to non-comm

I'd be willing to bet that all modern TVs support local offline firmware updates. Whether the actual firmware update binaries are readily available to non-commercial end users is another matter entirely (and of course equally important!). In the case of my recent-ish LG model, they are, and offline USB updates work fine.