This one is for the Mi Max 3 and not the Mi Mix 3. An official TWRP doesn't seem to be available yet, but you could follow the thread on XDA regarding this: https://forum.xda-developers.com/mi-mix-3/development
I assume you can find the TWRP here: https://www.androidfilehost.com/?w=files&flid=50678
Haven't tested this myself, only having a MI4, so you may need confirmation by someone else as well :)
Just installed sMiui 5.7.9 on my MI4 LTE using the updater app, coming from 5.5.29, and is now stuck on sMiui boot logo.
Having the stock recovery, both Mi-Recovery 2.0.1 and fastboot works fine, so I'm quite sure that I will get the phone up and running again :)
But being an idiot, I...
Thank you for the tip about Morelocale 2!! As a danish Mi2 user (and the danish locale having been removed some months ago), I have been looking for a app like this. Now many of my apps are in danish again :)
If there's any chance that the Danish language pack will be re-enabled, I would like to help out as well. I started back in April: https://github.com/ingbrzy/MA-XML-5.0-DANISH
After being told that Danish MIUI v5 would not be re-enabled, due to MIUI v6 being released soon, I lost my motivation...
I actually started to pick up on the Danish translation back in April, but apparently too late :-( Did some work on it, before being informed that it wouldn't get enabled anyway in MIUI v5, so I stopped again.
I picked up on MIUI v5 two months ago https://github.com/ingbrzy/MA-XML-5.0-DANISH but since the Danish translation did not get re-enabled I stopped wasting time on it.
As ingbrzy says, it's probably better to start over with a fresh MIUI v6 instead. See also this thread...
According to the first post, the Danish translation is still disabled. While I have started working on it, and committed some updates, it still needs lots of work being 9-10 months behind. Can you tell me when it will be activated again?