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?

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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.

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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

Honestly, this looks like has nothing to do with Bitcoin.
Specially the "Serial Number", a backup from bitcoin core wouldn't contain a serial number.
In fact, Bitcoin Client v0.1.0 doesn't even have an export/backup option, just manual copy-paste of the "wallet.dat" file.

Sadly, I can't add anything aside from my posts in the fist thread.

Just use the "Receive" tab.
From there, Electrum will automatically select one of your unused receiving address each time you create an invoice (receive queue).
That way, you don't have to manually check the addresses if those are already used, because as the consensus here: it's not recommended to reuse addresses.

Does btcrecover supports Samurai encrypted "auto backup"? (AFAIK it doesn't)

Anyway, for the token file: If you haven't changed "wirelessacedemic" and just changed the numbers and symbol, then it'll be easy.
You can use this simple token file:
The token file translated into: use "wirelessacademic" at the start, any 1~4 digits at the middle, and any symbol at the end.
This will get complicated if you've changed wirelessacademic into something else that you don't have any idea of, because it's long.

You can opt in for "Nested SegWit" addresses instead of "Native Segwit".
That way, you'll get the benefit of SegWit while keep using those services that doesn't support bech32 addresses.
The downside the total size of your transactions will be slightly higher than Native Segwit's but still lower than legacy (in vBytes).

You can make a Nested-SegWit Electrum wallet by manually generating a BIP39 seed and importing it to Electrum using the "Option" below the text box where you type the seed phrase,
and by selecting BIP39. You'll get an option to select "p2sh-segwit" in the next window.
If you decided to go for it, use a reputable BIP39 tool or use iancoleman's BIP39 tool (offline from source) to generate a BIP39 seed.