The instructions were as follows:
“ The Hard reset procedure is available since firmware 1.3.2, make sure that you have this version or any higher ones to be able to perform the procedure.
/!\ Before hard resetting your Keystep Pro, to avoid any projects or configuration loss, make sure to backup your projects within the Midi Control Center.
Once done proceed as follows :
Power up the keystep pro while holding both octave + and - buttons
Click the project encoder to confirm
The Reset process would then be launched and a completion message will be displayed once the device is defaulted.”
Hope it helps