I just got my cube orange and have been experiencing the same issue. I am trying to flash px4 through QGC daily (tried on multiple devices and both on stabile and daily version).
I followed everything written here and on Bootloader Issues with QGroundControl I am using Win 10 and downloaded daily release of qgc, however the issue is still present.
Do you have some suggestions?
Thank you for your reply. Could you be so kind and instruct me how to download QGC master? Is this the regular QGC or something else beside the daily build and the regular qgc? If it’s same as downloading from qgroundcontrol.com then I have already tried it.