what I do wrong?
Probably, you haven't synced BitcoinABC client and/or just directly copied the "
wallet.dat" from Bitcoin Core into the wallet directory of BitcoinABC.
If syncing the client didn't worked, you have to export the master private key (
if there no xprv, each of the prv keys) and import it into another client.
Do the suggestion above (
send your entire BTC balance to your other wallet) first; then,
Follow these steps to dump those keys in one go:
-snip-
Open Bitcoin-qt (*as administrator) click window->console, and type dumpwallet 'wallet1.txt' and a "wallet1.txt" file in the directory of your bitcoin-qt will be created.
Open it and you'll find your private keys;
if the wallet is new(er) version, you'll find an "extended private masterkey" that starts with xprv, you can paste that in Electrum instead of each prv keys.
In Electrum, create a new wallet using "Import Bitcoin addresses or private keys" option (Standard->Use a master key for xprv).
On 1st start, you might be required to open Electrum for a short while to properly display your balance (5-30minutes / 40mb+).
Quoting myself to save "
finger miles".
If your wallet is encrypted, use
walletpassphrase "your_passphrase" 300 (
including the " ") before entering dumpwallet command.
In your case, instead of downloading Electrum, you should use Electron Cash instead (
electroncash.org).