yes, look at this old thread:
https://www.mobileread.com/forums/sh...d.php?t=337788
the certs, server is offline for the mini, hence sync and update does not work anymore, before you needed to sync files in a different way, manual or calibre or something else.
your device i now not able to complete the setup because of missing sever support.
please try the offline sqlite db method, i am not sure if this works on the mini, check also the old thread and maybe someone has an idea how to complete offline setup on mini