It looks just like what happened to me when flashing 126.96.36.199, my bootloader got relocked, and upon trying to boot, I could just see the MI logo for a split second. The odd thing is, so far, the relocked bootloader problem happened only to people which started the update from the Updater app; people who did it directly from TWRP had not reported problems, until now.
Dear dev team, @ingbrzy, do you have any insights about this issue? It has happened to several people in different circumstances...
Several people have encountered the problem, but in different circumstances. In my case, it was somewhat easier to fix, because:
- I have a MI account with bootloader unlocking permissions
- My phone was able to enter fastboot mode
- I had set up the MI account on the phone prior to the bricking, which made possible to unlock the bootloader again
I described the steps I took here, and in that same thread there are tips for other unbricking procedures that might apply to your case... Good luck, hope you get your phone working again, and ask for help if you need it!
Then your bootloader got relocked and you'll have to unlock it to be able to flash TWRP and then xiaomi.eu. If unlocking is not possible by any reason, I think you'll have to flash an official ROM in EDL mode, as instructed in the same thread I linked above... good luck!