It's been a while. Do a normal update (preferably using fastboot method) But personally, I would do a clean update.
Don't forget to create a backup before updating.
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Yeah, i just flashed newest available xiaomi.eu once i got the phone and then forgot about it because everything worked
I now upgrade flashed NUWA_OS2.0.203.0.VMBCNXM_15 with bat file and i can confirm that it works