An "Invalid Signature" error indicates that your wallet has a configuration problem. This is typically due to a wallet being restored or upgraded and the incorrect account ID (or passphrase) is being used to complete this process. To resolve, follow the steps below:
- Ensure that you have securely documented your passphrase, private key, public key, and account ID
- Update to the latest version of the Hedera Wallet, if you have not already done so
- Perform a “Master Reset”, which is the last item in the settings menu on the top-right
- Restore your account with your passphrase and account ID
It is important that passphrases and account IDs be saved in safe and secure locations as they are critical to the restoration of a Hedera Wallet and accessing an account. It will be impossible to access an account without the proper passphrase and account ID.