It's true about requiring an existing programmed master key to program new keys (master or valet),valet keys cannot be used.
I have a feeling your 4Runner has the same newer immobilizer systems we use at Lexus. If so you do not have to replace the ECU,just reprogram the existing one,the dealer has to do it of course. They make a phone call to a tech line to get certain info,after which they can do the reprograming via scantool.
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