Error 1 means you are sending invalid MIDI to the HAWK. Check your MIDI set up is not sending other MIDI and make sure there are no MIDI loops.
Boot version 1.5 was written for version 2.53. But it was able to run on 2.55. I don't think it will go any further than that.
So you might actually be better off upgrading your boot ROM to the latest boot code.
/Mike
On Wed, 2019-03-13 at 19:45 +0000, damaandrea1@... [korgpolyex] wrote:
I've tried to downgrade to v2.65l and to 2.59a but is not working, error 1 appears