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All ELRS hardware will talk to all other ELRS hardware, including Radiomaster's ELRS transmitters and receivers. There are one or two exceptions from scummy companies that have been pilloried by the community, and you probably won't find them anymore. So long as the ELRS firmware running on both devices has the same major version number, you're good to go. ie. 3.3.1 will still talk to 3.0.1, but won't talk to 2.0.0. (The "major version" is the 1st number, the "minor version" is the 2nd number, and the "patch version" is the 3rd number. See Semantic Versioning for more info.)