I described the differences that I noticed above, and the delay when switching inputs also decreased, on the firmware from the forum when I switched, for example, from arc to optics, first there was a pop in the speakers and subwoofer, then 2.8224 Hz appeared on the display, then only the connection and the inscription 44.1 Hz appeared or 48 Hz, but with the new firmware this is not the case and 44.1 Hz or 48 Hz appears immediately.Something must have changed in this, because so far each version (regardless of what it contained inside) was 286,720 bytes, even the one I received by email from SMSL, and this one you attached (thanks!) is 290,816 bytes. Now I'm really curious about what's changing, what's happening! I'll upload it tonight.
(it is incomprehensible that so many versions can circulate in the public domain, while their website has still not been updated and they do not maintain that the latest version is always available!)
And of course, displaying the firmware version in the amplifier menu from 1.0 to 1.4.