Old garage door Liftmaster G5425, any options to add a remote?

• opensesame

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  OpenSesame attacks wireless garages and can open most fixed-code garages and gates in seconds using a Mattel toy

Yes, there are only 512 combinations for a 9 bit receiver like this. More switches adds more combinations, but all of these style openers are susceptible to a "replay attack" where you record the signal from the opener and play it back later. They are also at risk of more sophisticated brute force attacks (https://samy.pl/opensesame/) Modern openers use a "rolling code" system that is safer, but the truth of the matter is that it is very very rare for anyone to exploit these old openers.

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