user3029: I haven't accessed my blockchain.info account and I completely forgot my secondary password in order to send out bitcoins. I still have my mnemonic, but that's totally useless and MISLEADING as it states I can recover my Bitcoins with it. But it will not recover my secondary password on blockchain.info
How can I reset my secondary password ?

user9382: The secondary password is encoded by a mnemonic, but, if you change that password, the original mnemonic is still encoding the original password. The new password is encoded with a completely different mnemonic.
You're out of luck without brute forcing, and for that I'd check out BTCRecover by @cgurnee. 

user25088: Blockchain.info has two separate "mnemonics", one for each password (using that term loosely, since it's not the type of permanent mnemonic every other mnemonic-capable wallet uses). I agree they don't make it at all clear that you gain a second one once you add a second password.
It sounds like you only have the main one. If you have completely forgotten the second password and have no old wallet backups from before you added it, then you are pretty much out of luck, sorry....
If you have some idea of what your password might be, please refer to this question instead.

3029: <p>I haven't accessed my blockchain.info account and I completely forgot my secondary password in order to send out bitcoins. I still have my mnemonic, but that's totally useless and <strong>MISLEADING</strong> as it states I can recover my Bitcoins with it. But it will not recover my secondary password on blockchain.info</p>

<p>How can I reset my secondary password ?</p>
 9382: <p>The secondary password is encoded by a mnemonic, <strong>but</strong>, if you change that password, the original mnemonic is still encoding the <em>original</em> password. The new password is encoded with a completely different mnemonic.</p>

<p>You're out of luck without brute forcing, and for that I'd check out <a href="http://github.com/gurnec/btcrecover" rel="nofollow">BTCRecover by @cgurnee</a>. </p>
 25088: <p>Blockchain.info has two separate "mnemonics", one for each password (using that term loosely, since it's not the type of permanent mnemonic every other mnemonic-capable wallet uses). I agree they don't make it at all clear that you gain a <em>second</em> one once you add a second password.</p>

<p>It sounds like you only have the main one. If you have completely forgotten the second password and have no old wallet backups from before you added it, then you are pretty much out of luck, sorry....</p>

<p>If you have some idea of what your password might be, please refer to <a href="https://bitcoin.stackexchange.com/questions/3313/are-there-bitcoin-password-crackers-i-can-use-to-recover-forgotten-passwords">this question</a> instead.</p>
