Like the title says, I try everything and still not working, previously used was s7 Samsung and everything ok, now I'm only have this phone and can't change it.
The phone USB connect and disconnect every 5 seconds, try other cable and still not working.
Why so many ppl with this problem and DJI doesn't offer a solution?

Hello there. I am sorry for the trouble this has caused and thank you for reaching out. Upon checking the said mobile device ( Xiaomi Mi A2 ) that your are using on your DJI Mini 2 and on the DJI Fly application. I am sorry to say that the said mobile device is not recommended for the said DJI Drone and DJI application. DJI would suggest using a recommended mobile device for the DJI Mini 2 and for the DJI Fly application for compatibility and reliability purposes. There is a possibility that the Xiaomi Mi A2 will be able to work on the DJI Fly application. But however, since it's not yet optimized with the said DJI application we cannot guaranteed if it will work all the time and if it will be able to run all the functions of the DJI Fly application while using it. For reference I will post a link where in you can check the recommended mobile devices for the DJI Fly application ( https://www.dji.com/downloads/djiapp/dji-fly ).  In addition please rest assured that DJI is continuously testing multiple mobile devices to be added on the recommended mobile device list for the DJI Fly application. Thank you.