OK, it was actually not a firmware version issue on the hub, but the app version. I understood when installing a fresh version on a different device.

Long awaited capability. Thanks much!

However, the "Enable SDK Access" option does not appear in the app for me. Test Internet access is successful, and it reports firmware version 3.0.6; I did not find a way to force an update or if an update is actually due.

Am I missing something?