With s1clone you need to replace the ADFU driver with the one that comes with it. It is in
C:\Program Files\s1clone\driver\libusb, and you need to manually replace the driver from Device Manager.
Once you do that, s1clone will start to work :wink:, BUT this is the s1giveio driver, and will not work with normal update program. So you will need to switch drivers frequently if using s1clone and Product Tools on a regular basis.
PD. I discovered that s1clone works OK with 3.x.x firmware-based players and normal ADFU driver, this procedure is only required with 9.x.x ones using AK1025, strange but
AFAIK this is it.