I think the issue is he's missing the 'Wallet ID' because he said "nothing else" after the password and backup phrase.
So he can't try to login even if he wanted to.

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@Lord Sir Bitcoin Since this thread is bumped, I'll just mention this: Blockchain.com now accepts the user's email address to login.
You can now go straight to login page without using the backup phrase.

The -savagewallet command line option was removed from Bitcoin-qt/cli v0.21.0
it's moved to 'bitcoin-wallet' tool as "salvage".

Here's how to use the command using that tool:

Have you closed Electrum then renamed the wallet file that causing the issue before opening the newly created imported wallet?
That is to make sure that it wont open when you run Electrum .
Because it it's just thousands of transactions, it should work; it wouldn't if the original wallet is running in another instance or in the background since both will query the same server.

Otherwise, I'd second the suggested 'Bitcoin Core' and disable "pruning".

That's "cool" but insecure.
The number of fingerprint variations aren't even close to the total number of valid private keys.

Plus depending on the method; for example, if it's just based from basic details of the fingerprint (like our smartphone use), collisions may occur.
You'll get unique results if the method is based from the 'minute details', however, a slight scratch could produce a different result.

...I think the technology is already available but no one wants to implement such idea.

A possible workaround is to create an imported wallet using the private keys of all the other addresses excluding the one with thousands of deposits.
That's if the excluded address doesn't have a relatively large balance, otherwise, try to create another imported wallet with that address' PrvKey, it may work if not included with the rest.

To export the keys from your wallet: Go to 'Addresses' tab ("View->Show Addresses" to enable the tab), right-click on an address and select "private key".
Copy the private key including the script type (eg. p2pkh:Kjs539fa9A.......).

To create an imported wallet: Create a new wallet (File->Restore->Type a wallet name), select "Import Bitcoin addresses or private keys";
Then paste the keys including the script type, one line per key.

After that just make sure not to open the wallet that's failing to connect; renaming the wallet file from your drive should do the trick.

Based on the OP, it looks like it's your Private keys that are missing some characters.

Anyways, for the address, try using www.walletexplorer.com.
It has an auto-complete feature for the partial address that you will paste on their search box,
the catch is: the address should at least been used once (and not recent) for it to be registered to their database.

Example: if you search for "1BitcoinEaterAddre", it will automatically redirect you to "1BitcoinEaterAddressDontSendf59kuE".
More characters means more accurate search.

First thing is, your Electrum wallet wasn't an account like a bank, there's no central server that hodls the wallet/funds.
That said, no one can restore a wallet aside from the owner (yourself) by using its backup like the "Seed Phrase", wallet file or private keys.

If you think the amount of Bitcoin ($12?) is worth recovering, you can ask the "repairer" if they can recover the files from the disk. Doing the recovery yourself is risky.
The sole file that you need is the wallet file that has the same name as your wallet (default name: default_wallet, wallet_1, wallet_2, ...)

Same here like I've mentioned, that confirmed that I'm not the only one having trouble establishing a channel between two Electrum. :)

Try to post a new issue on Electrum's Github Repository: github.com/spesmilo/electrum/issues
Maybe the Devs have a workaround. But first, use 'search' to look for similar issues .

Nothing if it concerns only Ledger Live.
It's just an interface that your Ledger Nano use to watch the funds, the keys are safely stored in your Hardware wallet.

Just make sure that you wont expose your "Recovery Phrase" anywhere,
because some fake versions of Ledger Live ask the user to enter it in case you've downloaded a fake.

If the in-app updater doesn't work, download the latest version of Ledger Live from their website instead, the install it over the old version.
Link: https://www.ledger.com/ledger-live

If updating Ledger Live doesn't work, then you'll have to update the firmware by other means.

I'm not here to answer since I don't use Gemini or "Trevor", but is that a typo?
Because I haven't heard of a "Trevor One" hardware wallet and the site 'trevor.io' doesn't offer hardware wallet-related software

Those links aren't supposed to be download links.
Those are links to Electrum's repository (just for reference) and to ThomasV and SomberNight which have their contact info.

Just like other custodial wallets, it depends on their fee-estimation algorithm that's partly based from the average size of the mempools.

After clicking "Continue", the funds wont be sent immediately, you'll see another window showing the fee rate and the previous info.
There should be a settings icon near the fee where you can customize it.

There's an "up-down arrows" button at the right-hand side of the send window, it will switch the value from fiat to BTC (and vice versa).

Yes, there's a fee.
A selection of fee rate will be shown after you click "Continue".

Right... and it will display "watching only" beside the wallet type next to the wallet name (at the  title bar on top).

The links in my reply?
It's working at my end, I guess your ISP is blocking GitHub or some other reasons why you can't access it.

Ah, so it's basically something similar to v0.30 and v0.34's compatibility-breaking update to the key derivation.
But unfortunately, I don't know if there's another update like that.

You can try to ask the developers themselves from electrum's Github repository.
Specially ecdsa (ThomasV) and SomberNight. (they have email address in their GitHub profile)

That can't be.
Seed phrase has been compatible to the latest version since it's implemented,
even seed phrase from v0.30 will work with the latest (but wont restore the correct keys).

There are other wallets that use(d) their own implementation of seed phrase/mnemonic backups that aren't BIP39.
Example is blockchain.info's old account recovery phrase; you might have used other wallets aside from Electrum.

You mean can be downloaded from electrum.ecdsa.org?
IDK but this is the oldest archived page of the site's download page: web.archive.org/web/20121109025628/http://electrum.ecdsa.org/download.html

Those two are the only option if "Trampoline Routing" is enabled.
You can customize the remote node once you've disabled the said feature in the settings.

However, I haven't succeeded yet with creating a channel between two Electrum wallets.
You can try though - by providing each other's 'Lightning Node ID' as the "Remote Node ID" (Wallet->Information) followed by the IP address and port.
eg: 02d50fdf1806b54aee46a0ed8c6d8512bee87e88e25029f3384a983c43c5d6a16c@111.111.111.111:9735
But like I've said, it never worked at my end.

The two things that you may have missed are:

• Lightning should be enabled in the menu "Wallet->Information" if it's not ticked at least once yet (if it's created by an older version).
• The wallet's script (address) type should be Native Segwit ('bc1' address), other types including 2fa aren't compatible with Lightning.