QUOTE(azhar75 @ Nov 11 2016, 11:28 PM)
One Mi account can unlock many xiaomi devices. I have 2 Mi Accounts. If one is occupied/waiting for approval, I use the other to do unlock bootloader once SMS received. But cannot interchange devices between these 2 accounts.
I have updated my post. You are correct to get the idea of EDL will re-lock bootloader. Always use MiFlash (with Clean_All mode) so that bootloader remains unlocked. In MiFlash, there is also "
Clean_All and Lock" mode. This is also known as EDL...
the EDL that everyone is talking about.
Conclusions:
MiFlash + Clean_All = Bootloader remains unlocked (fastboot)
MiFlash + Clean_All and Lock = EDL (but in fastboot)
MiFlash + Save User Data = sort of OTA update (offline via fastboot)

So, as long as ur device can boot up to fastboot recovery, it's cureable from softbricked/bootloop.
FYI:

Many thanks for your guides.
Let me resummarize using another way:-
EDL mode + MiFlash + Clean_All = Bootloader locked (even Clean_All is used as when I was in China Dev ROM and flash to Global Stable ROM using EDL mode, I used Clean_All (Follow this guide
http://en.miui.com/thread-278599-1-1.html and delete flash_all_lock.sh and flash_all_lock.bat)
Fastboot mode + MiFlash + Clean_All = Bootloader remains unlocked.
Once it is in Global Stable ROM with unlocked bootloader, I used this tutorial to perform ROOT:
http://xiaomitips.com/guide/how-to-root-re...te-break-issue/because my phone can't get booted if I flashed to TWRP then SUPERSU.
Then I used Google Play Store to update SUPERSU into latest version.
It would be good if someone can put a detailed guide on how to root by using TWRP + SUPERSU with detailed steps + the version of TWRP and SUPERSU files should be used (inclusive of source of files)
It is very useful for newbie like me to perform unlock BL + ROOTED.