FrSky R9 firmware mess and how to live with it - the answer is FLEX

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It is not a rant! I will criticize but I will also give you a solution to the problem! And the problem is FrSky and the mess they created in their R9 radio system portfolio. The amount of different firmware version, incompatible with each other, for R9M and all the R9 receivers, is overwhelming. There is ACCST FCC, ACCST EU, FLEX, ACCESS, and ACCESS FLEX. Way too many! On top of that, not all firmware versions are compatible with all R9M modules and radios! How to live with that mess? The answer is simple: flash everything with FLEX firmware from the beginning of 2019 (20190201) and flash a radio with OpenTX-FLEX variant as well. Result? Everything works just great and there is no need to migrate to ACCESS at all!