There is more to it, but generally 8 generations of isolation and very selective culling for the desired traits at each step. Possibly better results if getting F1 seed from two or more sources from different years to cross your F2 moving forward. If your hybrid was from an interspecies cross, it could leave you with completely infertile seeds within a few generations.
Other than research, I am not experienced in this at all, so hopefully someone else can chime in.
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