I just tried it, no update available for me in USA with an Ibis Oso. iOS with Flow app 1.10.4 (but not sure where you find the "78" build version). So this means they are rolling it out by bike model and/or market location.
Edit: found the build, bottom of Settings screen. Also (78), and my...
I haven't seem any iOS Flow app updates for many weeks, so maybe they are still waiting for that to roll out across various markets before the firmware that goes with it become available?