I've used BTCRecover to check all combinations of my passwords (4 most probable +10 least probable), and 400+ most probable derivation paths (2 of them are most probable, 2 less probable and 4 slightly probable) .
No success.
I will bruteforce short passphrases with lower cases only up to 6 or 7 letters, but the chance of success is close to 0.
I guess its time to say goodbye to my bitcoins. It was a huge sum of money for me, but I still got like 30% of my money left, that will let me live my life comfortably in the next couple years. But I'll have to continue my career and stop playing videogames that much
Thx to everyone who tried to understand my problem and help.

What if I want to find my derivation path this way with a known passphrase? How do I add it to the script? Since I don't really want to bruteforce it at this moment, rather than try 10 of my most commonly used passwords.

If I put something stupid in derivation path like m/39'/0'/0', it doesn't find it, even if I add this derivation path to ./btcrecover-master/derivationpath-lists/Electrum.txt.

Huge! I was giving up deep down inside after trying all slightly realistic combinations of derivation path and a passphrase. Thank you, that's what I need.

Yes, no doubt.
Today I came to some more logical conclusions about my actions that day. I did ctrl+c, ctrl+v of m/44'/0'/0'/0/0 to derivation path. Then I clicked to IanColeman page https://iancoleman.io/bip39/. Checked that derivation path for BIP44 is m/44'/0'/0'/0. And since they contradicted with each other by one index, I decided that less is better, and that is when my flashback about deleting smth from derivation path actually happened. Then I thought since Electrum originally had even less zero's and I have no idea what corresponds to external and internal, I most likely decided to leave only m/44'/0'/0'. Then when restoring the wallet I was just changing h to ', and that was my second flashback. So most probably I just had to change 8 to 4, and h to ' x2.
So
60% chance derivation path was m/44'/0'/0'
35% chance derivation path was m/44'/0'/0'/0
5% chance it was smth stupid like m/44'/0'/x', m/44'/0'/x'/y, m/44'/0'/x/y, where max for x is 1, max for y is 3.
Since I tried all these variations it leaves me with only one conclusion. I most likely had an extension word in my seed phrase.
It couldn't be smth I use constantly, since I didn't even document that.
Will spend my evening bruteforcing in that direction.

It is, no doubt.


My conclusion to this moment is:
I created a seed phrase using electrum, it was in electrum format. But I wanted smth that can be restored without electrum. So I just used it as a Bip39 seed phrase, and it worked, even with a "Bip39 checksum failed".
Meanwhile I was reading articles about restoring a btc wallet only using a seed phrase. I found out I should use m/44'/0'/0'/0/0 for bitcoin. I also have a new flashback, that I deleted some of the indexes in the end with a thought "I don't know wtf is that, lets see if it works without it. (Thats a new detail I remembered yesterday before sleep). Also I remember replacing "h" with '.
It worked, I got a working wallet and was able to restore it after deleting. I printed seed phrase, learned it by heart. Then moved a large sum there. Then deleted and restored the wallet again. It worked, I was happy.
Thats pretty much it. If I'm right, the derivation path should not be too complicated, since I deleted some indexes out of it.
Here is the list of derivation paths I tried:

The list lacks structure, I'm currently trying to contact BTCRecover dev to buy a script, that could automate that.

I also tried m/44'/0'/0'/0           m/44'/0'/0'/0/0       m/44'/0'/0'    m/44'/0/0        m/44'/0'     m/44'/0    m/44'/0'/0  with everything I could use as an extended word for seed phrase, just in case.

Yeah, I did it this morning.

English is not my native language, I rarely speak it now, and even more rarely write in it. I'm also actively learning Spanish and phrase in Spanish is "frase". Regarding spelling in the seed phrase, all the words there were familiar, and Electrum shows hints, finishing your word. And also at that moment all I was caring about is to not mess the seed frase, thus missing out on everything else.

Haha, yes!
I’ve found out h is equal to ‘ in derivation path empirically.
I have a flashback where I was changing h to ‘ next to number 44. So most probablythe beginning is m/44’/
And I remember it had more than one ‘.
I was using Disk Drill, even did all the complicated stuff with lowering my disk security for deep scan.
No clouds, backups, nothing.
Pfrase is right Im sure.
Yes.
I feel like I did a good progress today in remembering some details today. Also did a lot of structured brute forcing by hands.Will continue tomorrow. And thx everyone for trying to help, means a lot now.

I've found an article on the forum that I was reading, when I was creating a wallet. Thats a huge leap forward.
It was stated there, that second index in derivation path for Bitcoin is (m/44'/0'/0'/0/0), and for Ethereum is 60 (m/44'/60'/0'/0/0).
I believed it was a common knowledge and changed it to 44, I'm pretty sure.
That still doesn't give me my wallet adress, I guess I changed smth in other indexes too. But much less to bruteforce now.

This topic has been moved to Electrum.

https://bitcointalk.org/index.php?topic=5552260.0

Absolutely agree.

Thanks, will do.

My idea was to make a wallet, that noone can access even knowing all my passwords and having a physical access to all my belongings. And yes, I was not too familiar with all the technicalities. I was travelling to Cambodia, and Vietnam and wasn't aware these were pretty safe countries.

yes, I'm using same version, tried on pc and mac.

I agree, why would I do it. I think I wanted smth that I can restore if electrum is unavailable, but I was too paranoid to use smth like bitaddress or Coleman's page. That's why I used electrum for a seed generation, and tried if it works, if I switch to BIP39. When it worked and I tested everything with a small amount of money,  I used this method. I just remember I saw the dialog with derivation path, not 100% sure I used it. But I'm almost sure after all the operations I deleted the wallet file, deleted electrum. Then restored everything and exhaled. Then deleted again.

Great question. No. I used "receive" tab, it gave me the address. I didn't even have addresses tab turned on in my view. I was new to Electrum. The second time I was using "receive" tab it gave me another address and I remember I was googling, if it was normal for Electrum to have different recieveing addresses.

You mean now, or 5 month ago? 5 month ago I restored the wallet and saw my ballance there.
2 days ago I restored it and the ballance was 0, and the adress was not in the list of adresses of the wallet.
The seed phrase is 100% correct. I think its the derivation path, that I changed.
I currently tried:
m/0'
m/0'/0'
m/0'/0'/0'
m/0'/0'/0'/0'
from m/44'/0'/0' to m/63'/0'/0'
m/0
m/0/0
m/0/0/0
m/0/0/0/0
m/0'/0/0
m/84'/0'/0'
m/84'/0'/1'
m/84'/0'/2'
m/84'/0'/3'
m/84'/0'/4'
m/84'/0'/5'
m/49/0/0
m/47'/0'/0'
m/44h/60h/0h

Any commonly used ones I missed? And can a moderator move this theme to Electrum section? Hopefully I'll get some more advice there.
Any suggestions on a good trustworthy firm, that can help me, if I fail to recover it? Lets just say I had more than one BTC there

I had printed it in 3 copies, later I copied it to metal plates. I also remember the phrase quite well.
I currently have 2 theories:
1) I for some reason used extended seed phrase (20% chance). Tried all my passwords as a 13th word, tried both electrum native segwit and BIP39.
2) I generated a seed phrase in Electrum. Then recovered the wallet, but using BEP39 option. (80%) I remember I was changing letters "h" for ' in derivation path. Probably I was copying the derivation path from some web article, so it should be smth fairly standard.  Address starts with bc1q, so there are less options. I tried standard derivation paths, nothing worked. (If someone has a list I can manually bruteforce with - I'd be thankful).
Tried checking browser history from that day - nothing, its gone. Tried google activity - nothing that day, prolly used incognito. Tried recovering deleted wallet file on my macbook - nothing. Somehow cannot even recover the one I've deleted today. Going to have some sleep and hope to get more ideas tomorrow. To be honest, I don't get, how I could fk up so bad. I remember I was double checking everything I was doing to be sure I would be able to repeat that.

I think I started to remember smth. I could generate an electrum seed fraze. Then when restoring selected Bip39 "to check compatibility", ignoring "bip39 checksum failed". Electrum allowes that. (I didn't know it altered adresses). Then probably changed smth in derivation path.
The question is how do I check all derivation paths, knowing seed and 2 adresses.

I think I tried like 500 times with different parameters in the past 20 hours.
Tried my seed frase on iancoleman.io, it shows "invalid mnemonic".
Looks like its a native Etherium seed frase. That means the only option is - I used an extended seed frase? Because you cannot mess with derivation path, when creating a seed in Etherium. Or am I wrong?

What I don't get is I allready restored the wallet.
Now I think I could use a 13th word in a seed frase, but I just cannot understand why would I not save it anywhere.
Also I could use LatinAmerican keyboard layout. But I tried it and there was no difference.

Since I know 2 adresses from that wallet, and both start with bc1q, it should be Native Segwit? Should I start bruteforcing different derivatiion paths for that seed frase? What derivation paths generate bc1q adresses? And how do I do it?

I only got one seed frase, I'm sure its right. It was printed on a paper, then carefully rewritten on metal plates. And I remember it.
I'm sure I was able to restore the wallet.
I doubt I'm that dumb to add an extended seed and fully rely on my memory with nothing on my metal plates.
I remember I was trying to create a seed that could be restored in other wallets than electrum. I remember I was clicking (*)Native segwit or smth in Electrum. There is a chance it was generated outside electrum. But I think I settled for electrum seed frase. I even could modify derivation path (very low probability). But I somehow restored it easily.
BTC are still there, I'm 100% sure the adress is mine. I still got a transaction from Trust to that adress in history. Also my keyboard layout could be LatinAmerican at that moment (I tried it, no difference).

My adress starts with bc1q.
I even used wallet.change_gap_limit(200) just in case.
wallet.is_mine gives false. What could I do wrong?

Five months ago I created a bitcoin wallet in electrum. I created the seed phrase in electrum (I'm 90% sure) on a macbook. I put a small amount there, deleted the wallet file, deleted electrum. I immediately reinstalled electrum, entered the seed phrase, the wallet was restored, the amount was displayed on the balance. The seed phrase is absolutely correct, I rewrote it many times and remembered it, entered it exactly from a piece of paper. The seed phrase was 12 words without an additional word. I transferred a larger sum there.

After that, I deleted the wallet file. Then restored it. Then deleted it again.

5 months later I am trying to restore it, the balance is 0. I found the address in the blockchain where I transferred the money, btc is there, but this address is not in the list of wallet addresses. I tried to restore the wallet in BlueWallet, it identified the seed phrase as electrum segwit. 0 ballance.

Any ideas what to do now?