lower leaves have burnt spots

A couple of th lower leaves have some burnt spots, I know the picture isn't good, but the lower leaves have some burnt spots. I made some mistakes early in the grow, had salt buildup which caused nute lock and then cal and mag deficiancies after that. Got those problems fixed, I'm wondering if the browning is just damage done earlier or if there's somethingim missing? All help would be greatly appreciated.

as long as your new growth is is healthy you have no problems

as mr ganja said if it stays localized then its just an old problem but if it starts spreading then you may have to cut back on the nutes a bit. ive a few plants that have wrecked bottom leaves. some strains just shed lower fan leaves. if it goes further up is when you have issues but not big issues yet so just keep an eye on it.
good luck
lu