Hi All !
I saw some posts regarding how to flash or switch to an official stock rom without being unlocked but afaik the whole procedure wasn't fully explained yet
Therefore I'll upload some self explanatory pictures but to be honest it is all fairly easy. So do follow the procedure down below.
Follow this video ( russian )
NOTE : DO USE THIS TOOL AT YOUR OWN RISK and DO MAKE A BACKUP OF ALL YOUR DATA ( because it'll be wiped ! )
1. download the Tool and go to the website thnx @franztesca - info - give this guy some credits
2. run the program and finish the installation
3. agree the disclaimer
4. choose between a normally running device or a bricked one (ouch )
5. if you see this image you'll have to enable USB debugging
6. your device is being found
7. collecting device information
8. choose the 3rd option
9. check the official xiaomi rom ( don't choose the other options because you'll need to be unlocked )
10. it will collect info again
11. choose your desired version and continue to agree on both next stages
12. enter into your MI-account (if needed again)
13. firmware is being downloaded
14. again press the 3rd option in recovery mode
15. it will push the downloaded file over adb
16. installing the rom file...
17. FINISHED !
E N J O Y