Bip39 Checksum Failed. It is actually value noting that a seed phrase grants use of your private keys. While private keys are cumbersome to implement and are available in a string of 256 alphanumeric characters, seed phrases are usually 12 or 24 words extended, and manufactured up of standard words. https://dantebmxis.wikifrontier.com/7780241/the_anatomy_of_the_bip39_phrase_entropy_words_and_stability