Q: Transmission gears out

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I mistakenly used Dexron 5 instead of the required Mercon 5. 2 days later all my forward gears went out completely, only reverse works. Is this issue related with the transmission fluid, if so will a transmission flush fix this issue. If unrelated, any suggestions on what it might be? Thank you for your time.

My car has 190000 miles.
My car has an automatic transmission.

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