Hi,
You need to get the device show up in the explorer. You can use any db explorer once that is happening
I would remove the kobo desktop app and the drivers ; even check the hidden devices in the windows device manager if anything kobo related is there
Then I would reset the device again like this :
https://help.kobo.com/hc/en-us/artic...your-Kobo-Mini
And connect it again to the computer ,
I wish you good luck and hope you can fix it !
BTW I am not familiar with the kobo mini , but does it have removable storage ? Maybe like this you can edit the database/ place the update file