I am sure it is in one of the following derivation paths:
M/44H/60H/0H/0 M/44H/60H/0H M/44'/60'/0'/0/0
I read somewhere that likes of MetaMask and Trust Wallet only use specific derivation paths (looks like MEW also now does this).
Did some digging and I can see Coinomi Wallet seems to be able to support importing wallet phrases with a custom derivation path. See here.
Important:
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Use the mobile app with a clean phone.
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Jot down the public key of the address containing the balances (the one you can see via Etherscan).
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Go offline on the phone with Coinomi installed. Follow the guide in the article above.
What you will be aiming for is to end up with the same public address. You may not see the balance in the wallet because you are doing all these "trial and error" offline. It might be a good idea to have another wallet ready before all these (one that you are confident that you can access and restore later on). You can go online on that phone with the wallet app once you are ready to make the transfer to the new wallet you prepared earlier. Good luck.
Hi OP.
A cold wallet is a wallet that's never been exposed online.
I'd say that the other kind of wallets come in "levels of heat".
I personally wouldn't use any wallet that is in a Windows environment; be it a standalone app or a browser extension. I would even extend to saying that this kind of wallet is just about as "hot" as an exchange wallet (which is always custodial). The only way I would use a wallet on a PC is if the OS is Linux.
Some will say to go the hardware wallet route. Here, you are trusting the manufacturer. With the recent Ledger fiasco, this a huge NO for me as well.
If you are simply storing (multisig wallets aside), an airgapped Linux PC or an airgapped Cell Phone with MEW OFFLINE is by far the best option. MEW is fully audited and open-source. So long as you are downloading a hash verified MEW and the Offline PC that you are using to generate your seed phrase/keystore/private keys is clean, you are very safe.
Create the wallet, note the generated public address, remove it, then try to restore it and compare to see if the generated public address is the same. When storing them coins, send a bit first and check first before sending the rest.
Take care.