We upgraded a FirePower 7120 from 6.2.2.1 to 6.2.3.7 and it too suffered from this bug. The bug should be edited so line This only affects the following device series: "70xx (not 71xx)" reads as "7xxx". On a side note, we have FirePower 8250's upgraded to 6.2.3.X and they did not suffer from the bug.
