Don't reset it just yet. If Opera is still working on your PC, make a backup of your bookmarks and export your saved passwords somewhere safe first. Opera says resetting the sync passphrase removes synced data from its servers, but data already stored locally stays on the device. Unfortunately, if you've forgotten the custom passphrase, Opera says you'll need to reset sync data to start syncing again. I'd protect what's on the PC before doing anything else. Opera's official explanation.
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