LEONARDPAUL:
But there is another problem : impossible to recover my presets ! The H9 control writes it's ok, but nothing has changed …
I can't say I've ever heard of someone using H9 Control to send a preset list to a stompbox and it not working. Since you're new to H9 Control, would you mind taking a look at the section in the user guide, "Saving a Preset List to a Stompbox", and verifying that this is how you're trying to send the preset list to your stompbox. The user guide is bundled into H9 Control and you can find it under Settings / Help, but you can also read it online:
