Beta OS version 1.1.5.9.9 was revved to 1.2.0 for production and is available on the Sequential support page, here:
https://www.sequential.com/updating-prophet-rev2-os/If you note issues with the oscillators following the update, please calibrate the wheels, clear all calibration data from the synth, and recalibrate the oscillators/filters thereafter.
Calibrate the Wheels: Press the GLOBAL button, navigate to the CALIBRATE WHEELS menu item, and press the WRITE button. Follow the onscreen instructions to perform the wheel calibration.
Clear Calibration Data: Hold both TRANSPOSE buttons and press the GLOBAL button. Navigate to the CLEAR CALIBRATION menu item and press the WRITE button.
Calibrate oscillators/filters: Press the GLOBAL button, navigate to the CALIBRATE menu item, press the WRITE button. The calibration will commence and its progress will be shown on screen.
**If you're updating from below OS 1.1.3, you must:**
Perform a Global Parameters Reset
Recalibrate oscillators/filters
If you are updating from 1.1.3 or above, these steps are not necessary.