The manufacturer of the D'CENT hardware wallet, IoTrust Co., Ltd., does not know the user's private key or mnemonic code.
D'CENT Wallet is a decentralized wallet that allows users to manage their own wallet private keys and cryptocurrency assets. The wallet company does not store any user information, so it is impossible for them to access any information related to the wallet.
It is impossible for the IoTrust to confirm which cryptocurrency accounts you have created on D'CENT. The recovery phrase (mnemonic code) is also generated from the secure chip inside the hardware when you create a wallet, and only the user can see it. Therefore, if you lose your wallet and do not have your mnemonic code, there is no way to recover your assets.