Yes, earlier I renamed a copy, but it ended in failure after I tried to restore it. I became completely clueless, and that’s why I created this post—because I need more precise help.
I still have the wallet.datxxxx.bak file with the .bak extension. I tried to follow the instructions, but Bitcoin Core runs into an error.
Right now, I have a copy renamed as wallet.dat, but I can’t restore it. In addition, I still have the .datxxxx.bak file that was created by Bitcoin Core in 2021.
It may sound ridiculous, but I’m unable to restore it.