I checked here ( http://www.tp-link.com/en/download/Archer-C8_V1.html#Firmware) it wasn't updated as of yesterday. Today I see the new version (with date 05/15) available, but yesterday the latest...

Model : Hardware Version : Not Clear Firmware Version : ISP : I've seen this update available for months for C7 and C9, but nothing (at least in the release notes) for C8, and since the last firmware...