Can you recall the original addresses? Do they start with "1", "3" or "bc1"?

Also, you said you've tried to enable the "BIP39" option, right?
If it happened to be a BIP39 SEED, was the message on the left side of the option said "BIP39 (checksum: failed)" or "BIP39 (checksum: ok)"?
Because any of the two will enable you to press "next" button to create the wallet but real BIP39 SEED will display as "ok".
If not, you might have miss-clicked one or changed the order (now or during the 1st wallet creation backup).

It's useless then, Electrum complies with backward compatibility with the SEED (not BIP39 SEEDs) and it's pretty much the same with the newer versions.
That's only an option if you still have the original wallet file.

Quoted and Verified via Brainwallet.

It's a legacy address, we don't have to use Electrum to verify it.

Uhh... Yes, that's what I said.
You just rephrased it except from the "fee" part.

Are you seriously considering the joke part and slightly considering the slightly serious part?

Hmm... maybe the problem is your technical knowledge or/and used client.

I've just sent $60 with <$1 fee (very high priority) and got confirmed after <10minutes; is that expensive?
I've sent $30 before with the same <$1 fee (very high priority) and got confirmed after <10minutes.
I've sent a $200 in BTC last month with the same fee and also got confirmed after the next block.

How's that possible?
I'm only using one input each for these transactions;
because during low mempool times, I'm consolidating all my small inputs and change when 1sat/byte fee is possible.
Always refer to the link's last page for the signal if it's possible to consolidate as cheap as possible.

But go on, you have the right to choose which coin to use, this is just an advice.

Send more Bitcoin Cash to your BSV deposit address to fill that $2500 minimum for their cross-chain recovery.... No that's a joke :D

Here's a slightly serious version: Deposit a $2,500 amount to the same wallet and now it will be qualified for the recovery and you can ask to recover the 1st transaction with it since it's the same address and private key.
That's if you can "gamble" that $2,500 'cause they said: "but a successful outcome is not and cannot be guaranteed".

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Seriously, There's nothing you can do about it, the terms clearly said that they will only attempt to recover your coins if it is higher than $2500 in value. Perhaps in the future when BCH miraculously pumped to turn your $174 (ATM) into +$2,500. (in reality, it's the opposite)

2013's block reward is 25BTC actually.

But I highly doubt that he'd solo mined at that time, CPUs or even GPUs are getting behind FPGAs and the first generation of ASICs at that time.
It could be no-account pool mining that rewards their share to the specified worker address or a pool with account feature and his bitcoins is in that pool all along.

@megamarclar Does your "15eax" address have a balance when you pasted it in a blockexplorer?
Also, if you happened to do solo mining, there's a slightly long orphaned chain at that time and hopefully, your node (v0.8.0) isn't one of those that's relaying that chain and got rewarded from any of those blocks.

It's funny how Coinbase ended up in this list of wallets, it's not even considered as wallet since you can't even export your address' private key.
They now didn't even call it as straight wallet in the support page, instead they call it "Wallet Services" like a respelled "Exchange-integrated Payment Processor".
I'm not against those kind of system though, it's convenient for small transactions.

~my ass.

Blockchain.com's wallet is one example of a real online wallet.

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Haven't voted 'cause either I haven't used most of the options or some aren't really a wallet.

AFAIK this will only work with Electrum.
Have you tried this prefix method with Bitcoin-qt or Bitcoin Core?

Test Transaction:

Don't know if it's intended or a bug but, even Offline Electrum wont allow you to open "preview" if the tx fee was set lower than 1sat/byte.
It's offline and haven't connected to a server yet the message said:

"This transaction requires a higher fee, or it will not be propagated by your current server
Try to raise your transaction fee, or use a server with a lower relay fee."

like the one in the OP.
If Electrum will allow you to directly click "send" after importing the Raw TX to sign it without clicking preview and the selected server allowed it, those methods might work.
Console command can be used as a workaround for signing the TX but requires intermediate to advance knowledge.

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Anyways, let's wrap it up:
@CoinSkipper Currently, it's hard to pull this out and probably will cost you more if you want to push it "for the sake of testing".
Just wait for the Bitcoin developers to implement a change in default relay minimum fee before attempting to send a <1sat/byte transaction.

That's what the underlined last sentence said   (What are you)

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The only related Pull request regarding lowering the default relay fee to 200sat/KvB that I searched from Github is this: Pull Request #13922
But is was a year old, closed and never got merged.

Oh, I missed that "under" word, I thought that the server he was connected to doesn't support 1sat/byte fee txs (lol). You don't need to correct me about bradcasting, it's because of that "missed word"
With that, he wont be able to open preview window (even offline), tried it on v3.3.3.

The only way to make the transaction is by using other tools like coinb.in by exporting the required private key(s) for signing and broadcast it to his own node or other's node/services that supports lower/0 fee.
It wont be relayed by almost all nodes though, maybe the question is theoretical.

Here's a workaround to that (aside from selecting a server with default node setting for minimum fee):

• Create the transaction with 1sat/byte fee and click 'preview'.
• On the preview window, click 'sign' and type your passphrase.
• Now, instead of clicking 'broadcast', hit 'copy' to copy the RAW transaction HEX to the clipboard.
• Browse in to any Bitcoin blockexplorer/tool that supports 'broadcast', paste the copied TX and broadcast it from there.

Notes:
∙ You don't need to hit save after broadcasting it online since it will be included in the history tab after a while as long as your client is online/synced.
∙ If your selected server didn't relay your tx (from the online blockexplorer's node) it may mot reflect your history tab 'til it got confirmed.
∙ Most online blockexplorer's node accepts 1sat/byte transaction.

Was the SEED created by Electrum through "Create a new SEED" option or the SEED was created through other tools like iancoleman.io and you used the "I already have a SEED" option to make a wallet using it?
If it is the latter, you cannot use an Android version to restore your wallet because it doesn't support "real" BIP39 SEED.

Usually, people who want to create a SegWit "3" address using Electrum do that.

AFAIK, that "24 times" is not the number of "retries" but the number of unconfirmed UTXO chain from the unconfirmed parent transaction. [Issue#9752]

Regarding your query, you can use RBF as long as it's flagged as "RBF" by enabling the right settings just as TryNinja said.

We're in the English forum so... at least use Google translate.
Google translate result:
lol, I have no idea what tolko and vepno mean.

If you're asking if it will work for W10, yes it will, but with issues specially if your GPUs have limited Memory.
If you prefer Windows, use W7 instead.

If it is a syncing issue, shouldn't be the history the same as the balance since it will be based from the last time the wallet was synced?
It must be something else.

Have you imported a "watch-only" address before?

Hmm, have you excluded v3.3.5 to your antivirus' real-time protection and scanner before? Because, all versions will always have a false positive detection due to the nature of Electrum's code (written in python).
If that's the case (or even not), exclude v3.3.6 as well.

It's up to you to trust it since you're already trusting v3.3.5 with false positive detection too (check both on virustotal.com)

Let me guess, that website "generated" 1BTC for you and you have to send 0.005BTC as a "transaction fee" to claim it, then you've sent them the said amount;
Am I correct?

Take note:
Not every miner can help you with this, only pool operators or solo miners that owns a mining node with a good chance of finding a block.
Most of the Bitcoin miners are mining with pools and can't help you with it.

If ever, make sure that you've set the minimum fee to 10sat/byte to be eligible for free "legit" acceleration services.

The domain (coinomi.store) is now for sale, dunno if the owner immediately parked it after it got popular or used these temporary sub-domains for the "real thing":
(Warning Scam Websites)

• www.coinomi.store
• mail.coinomi.store
• miner.coinomi.store
• coin.coinomi.store
• web-wallet.coinomi.store
• shop.coinomi.store
• www.test.coinomi.store

All were connected to the same Server.

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@michstuff72 add a noticeable warning to the link, people might get mislead by this thread.