I get 9.1.0.352 and 9.1.0.353 in the app, but no 9.1.0.350.I have the same problem. After updating to EMUI 9.1.0.326 (latest update from my country, Spain) focus problem when filmiing at 30fps with EIS persists, and as mentioned before, less noticeable at 60 fps without EIS. I sent all what they asked me to send and they told me via email that a solution is on the way by a future OTA but it never comes. We are with the August security patch yet and waiting for the fix. Filming in pro mode and selecting AS-F option gets rid of the problem but this is not the way. Very annoying problem that is starting to irritaing me.
EDIT. I found via Firmwarefinder, the app from Google Store that the update 9.1.0.350 is available and compatible with my Honor 10 model. I guess the same model we all have here, the european one. But I do not dare to do it, but there it is...
Honor Support said the 9.1.0.350 wasn't released yet in Germany, and some countries aren't getting this update.