Should you followed the measures previously mentioned now you have to be equipped to make and verify the correctness of BIP-39 seeds your self (with minimum help from tools like binary to hex to decimal converters). Standard recovery phrases use a specific list of 2048 words following the BIP39 standard https://worldlistpro.com/story20570418/new-step-by-step-map-for-ledger-seed-phrase-bip39