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I strongly suspect, you will need to find a remote that works with this TV model specifically.
That sort of security lock is not easy to overcome, otherwise.
But try this:
Locate the MENU button on the TV. (It may be under a sliding or folding cover. Or on the side of the TV where it isn't easy to see... use a flashlight up close if the light where the TV is, isn't strong.)
Hold down that MENU button for at least 10 seconds continuously. That may unlock it.
After that... looking for a remote that would work with this model, is probably the next best idea there is.