Your assets can be recovered in any of the following ways.
1. Re-purchase an imkey, importing a previously backed up helper at imkey, and restoring the wallet to retrieve the assets.
2. import the mnemonic phrase into imToken or other wallets that support the BIP39 protocol, and restore the wallet to recover the assets.
P.S. If you are not sure about what wallet supports BIP39 protocol, you can simply download imToken.