If you have followed all the steps above and you're still getting the "Unstable comport" error, the final test is to see if the problem is with your computer's hardware or operating system.
: Use a Virtual Serial Port Driver to create a dedicated pair (e.g., COM 1 and COM 2). unstable usb port miracle box 2.82 solution
Use an EDL cable or press Volume Up + Volume Down before inserting the cable to force the device into Qualcomm HS-USB QDLoader 9008 mode. If it drops to a black screen and disconnects, your drivers are not handling the EDL handshake fast enough; reinstall the QDLoader driver. If you have followed all the steps above
