Considering the last patch was in June, we're still trying to find out what it does.
An update has come out for one of the games for Nintendo's Black Friday deals.
Fire Emblem Warriors: Three Hopes has just updated to 1.0.2 as of today. As of yet, patch notes have not been published by Nintendo to determine what was changed in the update.
Players have found issues with the support logs displaying illogical combinations, though they have remained listed after the update.
UPDATE: A Japanese-language website has indicated the update resolves errors with transferring demo data, the wrong ending appearing under certain conditions, equipping battalions, and some battles becoming unwinnable.