Hi
You may try a method for recovering passwords I explained a few months ago at this post How to get files from Old Brave Browser without Sync (Bookmark, tokens, configs, etc) - #12 by CerealLover
I personally, tried this method, for a normally working Brave version, but it is not a straighforward one. Success is not guranteed.
Note: this method only works to recover the passwords saved on the same device you are trying to recover the passwords from.
But before begining the recovery process, I suggest you reinstall Brave as it might be corrupt, but after making a backup of Brave “User Data”.
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To save User Data, in a safe place, got to %LocalAppData%\BraveSoftware\Brave-Browser\ by pasting the url in Windows Explorer.
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To reinstall Brave, open
brave://settings/help
, click on the word “Version”, download setup.exe and reinstall Brave.