I had a similar (answered) question in this thread where we discussed a similar setup: https://bitcointalk.org/index.php?topic=5414023.msg61052365#msg61052365
You can also read my reply next to it for additional info.

...
Since each node has their own mempool, the replacement transaction for a transaction (without rbf flag) will be broadcasted to the nodes that enabled full rbf and wont be broadcasted to those who don't.
So if all nodes support it, it definitely can reach a pool or solo miner that supports full-rbf, then "Use Replace-By-Fee" setting wont be necessary.

But from the current stand-point, it may take years to reach a consensus.

It mainly depends on the setting: "Tools->Preferences->Transactions->Use Replace-By-Fee".
If it's disabled, the option "cancel (double-spend)" wont show up in the unconfirmed transaction's right-click menu.

On a side note, that behavior might change depending on the Electrum servers and bitcoin node users' decision on "Full RBF" which is already available in the latest version of Bitcoin Core.
If most Bitcoin Core nodes enable the option mempoolfullrbf=1 (which is disable by default), the Electrum setting above wont be necessary.

He's aiming for the "Multiple server" option in the tutorial that removes the "-1" arg which will enable Electrum to connect to other nodes (servers).
Manual selection in the GUI is basically the same as that since there's no checkbox or menu that will enable "oneserver".
Notice that in the 'Network' settings, there are "Connected nodes" below, that's what the 'multiple servers' is about.

But as mentioned, even if connecting exclusively to onion servers is implemented, it'll not improve his privacy even further.

Additionally, using oneserver while connecting to other people's server is not as secure as using the multiple servers option.

There was a PR attempt in GitHub that wasn't merged: https://github.com/spesmilo/electrum/pull/2191
Click the link to the issue (#2160) to see the discussion.

Some Devs argued that connecting exclusively to onion servers wont provide you extra privacy, the selected main onion server is good enough.
There's no explanation but maybe it's because your Electrum client will only sync with the server that you've selected, the "Connected nodes" are only for verification purposes.

Take note that addresses in his "Sending addresses" list will also be included in the command's results.
Don't know why they implemented it like that though.

Just load it to a fresh Bitcoin Core install and let it sync, it will check for the balance even if the wallet is password protected.
I'd recommend v24.0 (github.com/bitcoin/bitcoin/releases/tag/v24.0) for this since loading the wallet is as easy as using the menu "File->Restore Wallet...".

I think it's because it's stated in the proposal.
BIP-0173 strongly suggests to encode Bech32 address as uppercase in QR Codes: github.com/bitcoin/bips/blob/master/bip-0173.mediawiki#bech32

A command line option to generate lowercase would be great.

Setting it to uppercase will further increase the incompatibility of the QR Code.
There's a discussion about that in Bitcoin Core's GUI repo GitHub: https://github.com/bitcoin-core/gui/issues/145

I managed to make gpg4win work with openpgp keyserver by reading this article: www.stephenwagner.com/2021/09/30/sophos-dst-root-ca-x3-expiration-problems-fix/
And this tutorial on how to install certificates to Windows10/7: techglimpse.com/dst-root-ca-x3-expired-certificate-error

Apparently, it is because openpgp's certificate also relies on the expired (on Sept 2021) "DST Root CA X3" certificate which older versions of Windows 10/8/7 still use.
(I downloaded the der certificates from letsencrypt instead of the provided links, also needed a restart)

But since using other servers should work, just use that "easy method" instead.

There should be something more to this than just a pdf file wiping out your Electrum.
There is no reported vulnerability in Electrum that's directly linked with pdf files.

If you need advice, please provide more info on what happened.

But in the end, that confirmed bitcoin transaction cannot be reversed by anyone.

If that's the case, then "26 phrase" is better, or better yet 27 words~  :P

Anyways,
Linking the seed phrase's number of words or wallet's security to scam is unreasonable, people get scammed even if they are using hardware wallets.
Scammers are fooling victims into sending them funds willingly, so the issue isn't the wallet's security.

He didn't answer Little Mouse's question as well:
Nor reply to Husna QA's mention of the uncensored part of the image:

My guess is: The QR Code is censored so that user wont accidentally scan it, and the URI part of the invoice is censored so users wont be able to click it (but it's an image :P).

First, make sure that the private key that you've imported is the key of the address that you're trying to import:
In Mycelium, click on the "Accounts" tab and select your "Bitcoin SA" account that was created when you imported the prvKey.
Then go to "Balance" tab to see the address (click the QR Code to switch to the other address types).

- If one of the address is the same as the one with balance, then it's a simple server issue in Mycelium.
To rescan: go back to the "Accounts" tab and select your "Bitcoin SA" account, then click the menu (three dots) and select "Reload Account".
Wait for a few minutes until the loading animation stops.

- If none of the addresses is correct, then you might have a different private key.

You can still use the archived version of Electrum Dash (link),
import the private keys(s) to a new wallet using the option "Import Dash Addresses or Private Keys" instead of 'standard wallet'.

There are still online servers to connect to but I can't guarantee their legitimacy so if you ever got an error message when attempting to send funds, just do not follow it.
If ever, "export" the signed raw transaction instead and broadcast it using a push/broadcast service like (blockchair.com/broadcast?chain=dash)

Just an update on this post:

@Chandu141
If you have updated to Bitcoin Core version 24.0, you can simply use the new menu in the GUI: "File->Restore Wallet..".
Select the wallet.dat file and Core will do all the necessary steps to load it properly.

ETH can't be mined with GPU after the latest update, it shifted from POW to POS so people are now "staking" ETH instead.
But this is off-topic, just saying.

Okay, to prevent those false-positive balances, you must load the wallet properly next time.
Replacing a previously loaded wallet.dat will likely result with the same scenario since it will not trigger a rescan and just show you the wallet's last "remembered" balance.

Here's to load a wallet properly in the latest versions:

You can only downgrade from incompatible versions by restoring your seed phrase using "new wallet" menu.
If you have a backup of your wallet created before 4.3.2, it will also work.

(lol) I remember linking satoshi and theymos's usernames to anime characters before.

After scouring through my post history:

More info about my take on the pseudonym satoshi in the second quote, I also referenced Pokemon's "Satoshi Tajiri" in that post.

I mean the specific error that you had in the OP, since there's no answer "how" yet.
It wouldn't return with that error if the address on your clipboard from the image-to-text tool result was correct.

Those are the only two possible reasons in that case.

I tested a same wallet type and still can't reproduce the issue.

Have you reinstalled Electrum as suggested?
If so and the issue persists, follow Abdussamad's suggestion to post a new issue.

Also, providing the logs to the new "issue" will help a lot in solving it; to enable logging, tick the setting "Tools->Preferences->Misc->Write logs to file".
Restart Electrum and reproduce the issue; disable logging before closing Electrum.
The logs can be found in "logs" folder inside Electrum's datadir (location).