It's far from a custodial service though, because TrustedCoin doesn't have access to his funds since they only have 1 master private key in their server.
For full custody of the funds, it's still in the user's control since the two master prvKeys and the master pubKey (of Trustedcoin's key) are in the seed phrase.

So I can agree with hosseinimr93's first suggestion to jotaemeese, only if he still wants to use 2FA
and willing to pay for their service (which I don't think he's aware of).

Okay, so I assume that the Multibit wallet backup is corrupted then, because you wont get that error in Electrum with any other private keys aside from the four mentioned above.

There's no shortcut to this since the entropy (128 bit number) needs to be a 'UTF-8 normalized' mnemonic before you can get the 'binary seed'.
You'll need to do the above to convert it into a mnemonic, then use the result to your code.

The service has quite the reputation and the user has positive ratings as well: walletrecoveryservices
There's also a link to their 5-star Trustpilot review page: https://www.trustpilot.com/review/walletrecoveryservices.com

For the data, it depends on what they'll ask you but the whole portfolio plus a list of possible passphrases should be enough.

The transaction needs to have at least 1 confirmation for it to be included to the getBalance command's result.

How about 5Km2kuu7vtFDPpxywn4u3NLpbr5jKpTB3jsuDU2KYEqetwr388P or L5oLkpV3aqBjhki6LmvChTCV6odsp4SXM6FfU2Gppt5kFqRzExJJ?
Those will produce the same public keys as the private keys I listed above, and also the same error.

I haven't used MultiBit but I've heard that they've got a bug regarding generating keys outside range. (if not, it's from a different wallet)

Are you perhaps importing the private key:
5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAbuatmU or KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rFU73Nd2Mcv1?
Because it's the uncompressed and compressed WIF format of the invalid ECDSA private key 0x00.

I got the same error when I tried to import it to Electrum:

Unfortunately, he doesn't have it, the wallet file also doesn't contain the seed; otherwise, it defeats the purpose of a 2fa wallet.

In his previous thread, he mentioned that he got the private keys from the wallet.
All those are generated from the master private key that' saved in the wallet file which is only 1-out-of-the-2 required keys to spend from it,
he needs the second set of private keys generated from the 2nd master private key from the seed or the 2nd master private key itself.
He can't just simply pair the keys the he got from the wallet file to regenerate the addresses.

That won't work, Electrum doesn't have a method on importing individual keys for MultiSig address nor supports a "p2wsh:" prefix for PrvKey import.

I had a reply to your previous thread that was deleted (prob. because the OP isn't English),
Since the contents are similar, I'll just repost my reply here:

Unfortunately, those private keys are only 1-out-of-the-2 required 'private keys' and 1-out-of-the-3 required 'public keys' to re-create the MultiSig addresses of that 2fa wallet.
Without the seed phrase, there's absolutely no way for you to spent your funds without the intervention of Trustedcoin (Electrum's 2fa service provider).
The wallet file only has one key, they have the other key, your seed had two keys.

Electrum wallets wont suddenly switch between standard->2fa.
My guess is it's just simply a different wallet file (File->Open to select);
Or you might have initially created a 2fa wallet but never really spent funds before so it never asked you to enter a 2fa code before.

Anyway, if your funds is in that 2fa wallet and you have the email address that's used to register to Trustedcoin (during the creation of the 2fa wallet),
then try to contact them using that email explaining that you've lost the seed phrase but have access to the wallet and email.
I've seen successful recoveries using this method before.

You cannot import private keys to a hardware wallet (or at least with Trezor and Ledger).
So you actually don't have a choice but to sweep, maybe that's why "many recommended" it than import.

Yes but not-quite-occasionally,
I've been plugging it once or twice a year to check the contents for possible corruption.

It worked at the end after updating 'Ledger Live' so it may not be the case.
He mentioned it in his last reply (the arrangement of his sentences is confusing):

You can check the "block height" where the transaction is included.
That way, you can get a close approximate of the txn's date based from the height even if blockexplorers' dates wont match;
In blockchain.com, it is labeled as "Included in Block".

Passcodes?

• BIP39 "Seed phrases" doesn't always consist of 12 words. It can be 3, 6, 9, 12, 15..... but not 10 since the entropy wont be a multiple of 32bits.
  
• "Passphrase" for Brainwallet can be 10-words since the input's number of words is irrelevant.
  
• Or are you thinking of a specific wallet/client with 10-words backup?

---

For questions like this, it's better to be posted on "Beginners & Help" board instead (link),
I'll also ask a mod to move this topic to that board.

The option is still available in version 0.96.5.
However, he used a new Armory installation and just imported the wallet/root-key so the wallet is already rescanned for balance and it ended up empty.

You can still try the latest version before throwing the towel, there could be an issue with v0.96.
As you can see in the note on 0.96's download page: www.bitcoinarmory.com (old Armory website), the latest release can now be downloaded from btcarmory.com.

Upgrade to the latest, then use "Help->Rebuild and Rescan Databases";
if still empty, try "Help->Rescan Balance" for the last time.

---

Nice observation
You can tell based from "390371 blocks", I see.

That's quite...
There's a limit on how many Bitcoins that will be generated which is very close to 21,000,0000, your balance was way beyond that.
Obviously, there's something wrong with that instance.

The actual latest version is v0.96.5 from btcarmory.com.
Anyways, since it synced, and the balance is 0, then the balance is actually not surprisingly zero.
You can try to install the latest version and rescan and rebuild Armory's database (it wont resyc Bitcoin core).

What happens if you use their "Device Change" link in their webpage?
It's only requiring email address, then some sort of "Voice Verification" as stated in their user manual: abbccoin.com/Aladdin_Pro_Wallet_Manual_English-v2.pdf (Pages 35-39)

Maybe it has something to do with the first or other logics of "Smart Timestamps":
github.com/bitcoin/bitcoin/blob/master/src/wallet/wallet.cpp#L2380-L2396

If not, it could be related to the "wrong timestamp" bug when using -rescan:
github.com/bitcoin/bitcoin/issues/6662

I see where this is coming from.
It's a matter of preference though, but I'd always suggest newbies not to use the advanced features such as hidden tabs or console.

Bitcoin has no custodian since it's a "decentralized digital currency" which is held by every nodes in the network.
No one is in full control of the blockchain.

If you like to contact the current developers, you can find them in Bitcoin's Repository: https://github.com/bitcoin/bitcoin/graphs/contributors