Prophet 6 - after turning on the Prophet 6, only the number 6 on the display

[Tomasz]

Voltage failure occurred during installation OS.
Now after turning on the Prophet 6, only the number 6 on the display shows to me and nothing else.
Has anyone had the same problem?

[extempo]

You can reload the OS in bootloader mode, though it must be with MIDI DIN (not USB). To enter bootloader mode, hold WRITE while powering on. You will see an animation on the display. From here, simply transmit the OS sysex file via MIDI DIN.