I know the US Standard firmware works on European Typhoon Q500 4K because I've already change the firmware several months ago, but my Typhoon H arrived today and I tried several times changing to standard it says its updated the firmware, but when you check its still states its the E version, so at the moment this looks like its a no go to change from European to Standard firmware, I hope to fly it tomorrow and see what sort of video range I get with the E firmware, I know with the Q500 it made a big difference with standard firmware video signal was far more reliable, hopefully we can find a way around this issue which is stopping the update.