Sky.de has made some changes to the encryption.
It was switched from 64 bit to 48 bit checksum. Disableccrw must be activated for the 1838, as well as build your own Oscam with Cak7 support, or take the current from the trunk (11719).
The changes must be done on the server side.
Regardless of the above is probably on 20.06.23 end.
From then on, the 1838 will no longer work with the generic keyset. For another share a unique keyset is necessary, to get it is difficult, but not impossible...