Does your boot up show B19F26? If that is what you see when you start up your HAWK while holding down the bank hold button, then you don't have the latest boot code.
If you hold down the bank hold button and power up with boot code version 1.98, 1.99 and 2.00, you will see "B x. xx" followed by "F x. xx".
You must have version 1.98 or higher before you can upgrade to v2.66.
You can downgrade to v2.65 to recover your synth. And if that version does not work. You can downgrade even further.
But if you absolutely sure that you want to get to version 2.66 then you will need to upgrade your boot rom.
Unless I got something wrong. So let us know if you actually see "B19F26"?
/Mike
On Wed, 2019-03-13 at 16:41 +0000, damaandrea1@... [korgpolyex] wrote: