The buds in the jar need to be at least slightly moist or nothing is really happening. If you over dried them during the hang, you may be able to activate cure by adding a few fresh pot leaves to the jar for 12-24 hours, then cure as prescribed, ie:mostly closed jar, breathed daily at least once.
Some report success by simply misting the dried buds, then placing them back in the jar(s) and finishing as planned.
Not sure what you mean by "too late for curing" but there's no time limit on how long a grower can cure. Mine take about a month, after jarring, to reduce to the 10-15% humidity desired in the finished product.