"The phrases which you have are simply encodings of the hashes of the passwords you used for the wallets. They are a password recovery tool, nothing more. "
exactly, i know that ..but i really cant understand why blockchain.info in they play fair and correctly and dont want scam his first members why the hell dont offer this "tool" , why they dont keep online this account recovery option - in my opinion in my case are for sure thousand of accounts with many thousands of btc on it!

https://login.blockchain.com/#/recover  work for 12 words standard phrases (when i put my mnemonic here site say Invalid passphrase)
https://login.blockchain.com/wallet/recover-wallet   work for STANDARD legacy wallet recovery phrases (although they are longer but need be standard)
when i put my mnemonic here site say invalid checksum exactly because
my mnemonic words are not in the standard wordlist, which is used now to generate now the private keys
in 2014 for blockchain.info accounts was not necessay to have email attached, so i dont have any email attached to this accounts
+at that time they dont provided backup service to can download or request via email your wallet.dat

Lucius .. now is easy to say why i truted him in 2014, but if member with bitcoin from begin, from 2014 for sure remember at that time dont was other safe alternative for bitcoin WEB wallet

yes, you have right only blockchain.info support could be help ... but they leave us alone, no help, no support for his OLD SHIT ...

and yes you have right my mnemonic is from before this new implementation - at that time the mnemonic = long passphrase was used by blockchain ONLY to decode/decrypt wallet id and password - has NOTHING to do with the private keys

https://login.blockchain.com/#/recover  work for 12 words standard phrases

https://login.blockchain.com/wallet/recover-wallet   work for STANDARD legacy wallet recovery phrases (although they are longer but need be standard)

EXPECT HELP FROM A OLD BLOCKCHAIN.INFO DEVELOPER OR SUPPORT .. shame him, that he leave a lot of his old = fisrt members alone with this problem

I need HELP.
Recently i fund some really old (i think from 2014 when blockchain.info started) mnemonic (passphrase)
In that time all my family was bitcoin enthusiast, so i have 5 mnemonic (passphrase) from 5 old blockchain wallets.
Absolutly all was deleted, so i forgot the wallet id and password (in that time blockchain.info not requested attached email for accounts)
The problem is that this mnemonic (passphrase) are not standard like 12 or 24 words seed + the words are not from the standard words list.
My mnemonic (passphrase) have different lengt, like 14, 17, 19 words
From my research blockchain.info in that time, at begin dont used standard words and standard longs seeds ... as i understanded his mnemonic (passphrase) was only to "decode" wallet id and password.
With the new technic bip39 master and blockchain.info account and password recovery i can do nothing   ..
Blockchain support not answer at all, seems they dont want help me
Any help?