the receiver to your PC while the receiver is powered off . Open the loader program and select the 2021 channel file. Click Start on the loader and then Power On the receiver.
for the progress bar to reach 100% and for the receiver to display "End" or restart automatically.
Verify that your hardware version matches the software exactly. Using a loader or file meant for a different "A-series" model (like the A999) can "brick" the device, making it unusable.