Hello,
Just to reports that I have successfully revived my Kobo Clara 2E N506 thanks to DNSB's image !
The curious part, was that on my kobo there was glue inside on each internal connector and the Micro SD card. So I have destroyed the card holder to remove it, but the new one is hold in place with some tape and a few millimeters of soft foam positioned on top of the card, pushing it toward the SD connectors by the back cover.
Seems to do the job, but it is clearly not nice from kobo to glue these things just to prevent repairs...