It makes sense that 07/2019 is the minimum i-step required to support DR. That was when the app was first made available for new purchases so obviously supports it.
There was a question as to whether 11/2019 was needed for the retro purchase because some users in AUSY reported that it only became available in CD after upgrading to 11/2019. Maybe they skipped 07/2019, or it was a coincidence.
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