-rescan worked fine
how can i see, if my wallet is hd?
If you started bitcoin core after version 0.13.0, or are using a wallet that has been generated after 0.13.0, you will automatically by default using a HD wallet.
See https://en.bitcoin.it/wiki/Deterministic_wallet
Starting Bitcoin Core isn’t sufficient, there are more steps involved than launching it. If you mean he started using Bitcoin Core, after 0.13.0, and didn’t previously have a wallet.dat created, that is different.
You're right. I formulated that pretty badly, indeed.
I don't think there's a way to make previous non-HD bitcoin core wallets HD right? Other then importing all the private keys (walletdump) into a new ( wallet generated AFTER .13.0) wallet.dat