Change ports ti implicit deny

I want to block all outgoing ports bar my chosen ones say
80, 443, and 21 for instance. it is NOT possible say to range 0-79 81-XXX; because it doesn't work. i need to alter thhe firmware from an impcit allow to an implict deny
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More about change ports implicit deny
  1. on a linksys i presume
  2. I want to block all outgoing ports bar my chosen ones say
    80, 443, and 21 for instance. it is NOT possible say to range 0-79 81-XXX; because it doesn't work. i need to alter the firmware from an implicit allow to an implicit deny.

    Linksys router ( sorry for the typos)
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