Yes, that does appear to be the case. I have a -H version and DFU'd the built-in firmware "1-of-11 H-LSI" and everything works well. The application's user interface makes DFU changes very easy via the "Upload Firmware" button.
I'm pretty sure there are new commands in the application that work only with the built-in firmware loads. For example, some older firmware versions don't support the bandwidth selections from the application. After loading the built-in firmware, it supports this feature flawlessly.
