Hi , I had NKN wallet in 2018-2019 which was erc-5. I have login/password, public address and private key. I can I access to this ? The wallet.nkn.org restore does not work. It is impossible the private key is incorrect.
At that time there is NEP-5 NKN tokens. You could use a NEO/NEP-5 compatible wallet, e.g. O3 wallet, to try to recover your wallet.