When you were using imToken 1.0, one mnemonic can only manage one Ethereum wallet. And when you use imToken 2.0, you can manage a Bitcoin wallet, an Ethereum wallet, and an EOS wallet together with one mnemonic under a digital identity.
Here are two points to note:
1. Please backup this mnemonic properly and keep it safe, don't share it with others
2. The mnemonic can only be used to manage Bitcoin Wallet, Ethereum Wallet and EOS Wallet under current identity, and cannot be used to manage other imported wallets.
Case 1: If you are using imToken 2.0 for the first time, and have not backed up the mnemonic before.
You can create a new digital identity by clicking "Create Identity"
Case 2: Using imToken 2.0 for the first time, but have the mnemonic backed up from 1.0 version.
If you have previously backed up your mnemonic, you can create a digital identity by clicking "Recover Identity". The previous mnemonic can only manage one Ethereum wallet in 1.0 version. Now, this mnemonic can manage Bitcoin, Ethereum and EOS together in 2.0.
Case 3: Had a digital identity already and want to create a new one.
You should exit the current identity at first. Select "My Profile" -> click on the top avatar to enter the "My Identity" interface, then Logout Current Identity.
Please note: Before exiting the identity, please check again and again. Must make sure the mnemonic of the identity was backed up. If the mnemonic was lost, please back up the mnemonic of the current identity then exit the current identity.