I had a backup of my wallet.dat a few years ago, which was encrypted for sure.
But when I try to reload it now, it shows 0 balance and no historical transactions after the whole blockchain sync, and it is weird that the option of encrypt wallet is available.
Whether I try the bitcoin core 0.14.2 or the bitcoin 27.0, it turns out to be the same.
The wallet.dat might be corrupted because I might copy it while the bitcoin core was running.
I tried pywallet to dump the private keys but the none of them is the right one.
Also I tried btcrecover, and it said the wallet.dat is unencrypted.
Now I don't know what else to do but to ask for help, guys please help!
I might not be able to provide a perfect solution for this, but I have been thinking; it could really be possible that you copied the wallet.dat when the Bitcoin core has not fully updated. There are many possibilities here because it is sounding strange to me that wallet balance is showing zero yet there are no transactions history to this effect. Maybe it happens, I don't really know and I will love to be cleared on how all this happens just so I can take precautionary measures for myself too.