Wallet upgrade from 2.x without passphrase

Hi!
5 years ago i bought some syscoin and transferred it to my wallet. I’m trying to upgrade it now to current version but unfortunately I forgot my passphrase to unlock it.
I’ve backed up wallet.dat and all other files from AppData folder back than but can’t remember what was my password to unlock my wallet to dump my private keys.
Is there a way to recover it.?
Thanks.