Here’s a few working methods on how you can start your Xiaomi Redmi Note 3 Pro Special Edition phone in EDL or Emergency download mode. From Diagnostic 900E to QDLoader 9008.
1: Boot into EDL mode from PC:
adb reboot edl
2. Boot turned off phone in EDL:
Connect your turned off device to PC and press both volume buttons at the same moment.
Here’s a method you can try
Check out this YouTube video to find out how you can make a working Deep Flash Cable by yourself: