Lost my Bitcoin wallet and have only 11 out of 12 mnemonic seed phrase words. How can I get my Bitcoins? I am new to the whole Bitcoin thing, and I am having my first attempt almost going sour. I lost where I created my wallet. I have my Bitcoin address and only 11 of my mnemonic seed phrase words (of 12). I attempted using a word I thought was it and then recovered a wallet on bread wallet, but after sync in, it was still zero balance for hours. I contacted the support group and they told me that I had probably made a mistake.

What can I do?
If you are missing the first word and you know the rest of the 11 words, there are 2048 possible mnemonics but only ~128 of them are valid.
Using Python and this library you can print all the valid ones with this simple script:
from cryptotools.BTC.HD import check, WORDS

phrase = &quot;{x} decrease enjoy credit fold prepare school midnight flower wrong false already&quot;

for word in WORDS:
    mnemonic = phrase.format(x=word)
    if check(mnemonic):
        print(mnemonic)

The output is:
alcohol decrease enjoy credit fold prepare school midnight flower wrong false already
alien decrease enjoy credit fold prepare school midnight flower wrong false already
ancient decrease enjoy credit fold prepare school midnight flower wrong false already
animal decrease enjoy credit fold prepare school midnight flower wrong false already
apple decrease enjoy credit fold prepare school midnight flower wrong false already
baby decrease enjoy credit fold prepare school midnight flower wrong false already
bamboo decrease enjoy credit fold prepare school midnight flower wrong false already
become decrease enjoy credit fold prepare school midnight flower wrong false already
blanket decrease enjoy credit fold prepare school midnight flower wrong false already
body decrease enjoy credit fold prepare school midnight flower wrong false already
...

Then you can try them one by one to a wallet that support BIP39. Obviously change the last 11 words in my example with your words.
Good luck!