I have created an account in testnet which I know the address and the password of, but I did not backup the private key file. Can I somehow create the key file again using the password? Or is my account locked inside forever?
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You cannot recreate the private key file. The password is used to decrypt the key file, and then an address is generated from the private key in a non-reversible way. The private key is really the most important piece and should be backed up.