Which is the lowest serial number that can be upgraded with the new firmware? Post it here so any AC300 owner can determine if their units can take that firmware.
Looks to me like if the ARM Version is 4037.** then you can update and if it’s 4032.** then you can’t. I haven’t seen any other ARM versions on the forums although the sample size is small. 
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Hi @Raymondjram, Thank you for your concern about this issue.
@Sideeffect’s explanation is correct.
Currently, only ARM versions starting with 4037 can enable this function through firmware pushing. Other versions cannot be updated yet.