Anyone know how to generate RF codes for a garage door opener?

Bit of a niche question but there are a couple of million people in the sub so I’m hoping someone can help.

I have an old automated garage door that is operated using a standard RF key fob. I have successfully cloned the signal onto additional learning key fobs but my biggest issue is changing the code.

According to the manufacturer this needs to be done using a master remote that has dip switches that can be used to generate a new code but I do not have this master remote. I cannot get a master remote so that option is out.

I do have a Broadlink RM4 Pro and Home Assistant. And I can import the RF key strings into Home Assistant.

Does anyone know how I might be able to generate a new code which can be sent using the RM4 to teach the garage door a new combination?

Or can anyone point me to any resource that might show me how to manually edit a Hex code to create a new one? I know nothing about RF codes and I assume I can’t just change a letter or number in the existing code and push it back.

Submitted by ezfrag2016

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