Recover Apple Keychain (arkoinad.com)

The post describes how the author got locked out of a work MacBook and, after resetting the macOS password, lost and stopped syncing encrypted keychain data. They explain that the reset doesn’t re-encrypt keychain items with the new password, but show a simple manual restore by swapping the newly created `login.keychain-db` with the renamed backup (`login_renamed_1.keychain-db`) in `~/Library/Keychains`. After replacing the files and entering the old keychain password in Keychain Access, the data syncs again and uses the updated password going forward.