Recover your Xiaomi@Velastroll
1 - Install adb on your PC (64-bits) if you haven't installed yet, selecting UniversalAdbDriverSetup.
2 - Install miPhone (link)
3 - Download a previous ROM:
4 - Download Fastboot-to-EDL (Link).
5 - Extract all and execute Reboot.bat
6 - Push (vol- and power) simultaneously to enter in a Fastboot.
7 - Connect your phone to the PC and push any key (of the keyboard).
Your phone must be with black screen and a red led.
8 - Extract the ROM that you had downloaded in C: partition until you see like:
9 - Open miFlash.
10 - Click to browse and select C: (or where you have extracted the ROM)
11 - Select "Flash all except data and storage" (although this proccess could erase all your smartphone files like photos, apps, etc), and if miFlash shows COM10 in 'Device', select Flash.
12 - If 'Device' shows a different number, install again the ADB, turn off your PC, and repeat the steps again, because the ROM canot be installed:
This is a personal solution that has worked for me in Redmi Note 3 Pro, but it is not verified that it works in all possible cases.
If you need anything, could send me a message in twitter or telegram: