Hey, I have a non +Drive MKII on 1.32 os and can overwrite the factory waveforms, I’ve got the Oxford Overdrive ones in mine right now so don’t think they are locked by default.

It should work if you follow from step 5 in the PDF that comes with that pack. I checked in the Digipro Mgr but can’t see any lock/unlock options. Make sure you have MIDI IN+OUT connected and enable SDS Handshake in C6. Also once you have highlighted all the waveforms, click the Digipro button before you send them.

Does it say “waiting…” on the mono before you get the “denied” error?