Hey Davidfor,
Thanks a lot for your help. I downloaded the KoboTouchExtended driver, deactivated all the others, made sure the config was alright... and it didn't solve a thing !
Then I realized collections were deactivated by Calibre and I had to go to Device>Config>Metadata and then tick the box "Intent to use a more recent firmware"
Problem solved
But I looked into the Kobo Utilities plugin and couldn't find how to fetch the reading status. Would really appreciate it if you could detail how to do this.
Thanks a lot