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As stated use nothing but water to flush. If in soil,flush with a minimum of 3times the amount of soil. So if in a 3 gallon container flush with 9 gallons of water. Then feed with bat guano or molasses,both with help you out much.
To me it looks like nute burn but the worst of it is over. I would just cut off the burned leaves becuase they no longer serve a purpose and are blocking light right now.
Once you cut off the leaves, the plant will look better and you can more carefully monitor new growth. You have to do a *lot* to actually kill the plant so you'll yield and do fine this grow. No worries there.