Just to report back that the firmware update issues I have been experiencing have now been fixed with help from DSI support. Involved loading a syx file version of the latest firmware update, then backleveling using a bin file of the previous version and then a fresh update using the latest bin file version. My PX is now up and running, encoder skipping fix working nicely and ready to rock and roll as they say. I'm very pleased with the responsive customer support from DSI, well done. One very happy customer.
So what EXACTLY did you do? Here's what I just did, twice, without success:
1. On very first boot-up: 80% of sampled instruments' names are labeled, "ERROR," and emit no sound.
2. DSI sent me "PX_Main_1.1.1.0.1.syx" which I successfully downloaded into the Prophet X via MIDI DIN.
3. After SYSEX download, upon re-start, the PX displayed the exact same errors as on first boot-up.
4. After upgrading firmare to "PxUpdate_V1.2.0.0.0.bin" via USB, the PX is bricked (all screens display "snow").
The Prophet X is currently frozen and makes no sounds. Re-downloading "PX_Main_1.1.1.0.1.syx" vis MIDI DIN into the PX only reverts it back to its original error-state.
If I understood your post correctly, you did the following:
1. Downloaded "PX_Main_1.1.1.0.1.syx" into the Prophet X via MIDI DIN.
2. Then "back-graded" the firmware using the .BIN version of an earlier firmware version (filename?) into the Prophet X via USB.
3. Performed a normal firmware .BIN update using "PxUpdate_V1.2.0.0.0.bin" via USB drive inserted into the Prophet X.