I wanted to make more coins on stacking. But unfortunately I did not create a backup wallet and successfully updated the wallet. After the update, access to the wallet was lost forever, since I do not know my private key and do not have backup.
I admit my mistake, but all the same, developers had to share such nuances and protection from a fool like me.

P.S. out of 40,000 coins per day online, I received 380 additional coins.