if you are still on a xiaomi or any inofficial vendor rom you have to go through the same process as i described above. first unlock bootloader, install twrp, install xiaomi.eu rom.
if you allready have a xiaomi.eu rom now just download any recent version from here and install via twrp.
you could also try adb commands on your computer to boot into recovery. tutorial: http://en.miui.com/thread-301077-1-1.html
no. you have to wipe data (factory reset). i recommend you do full backup in twrp first in case you want to go back to your current version.
in twrp you press "wipe" button. in next screen it will say "factory reset wipe data cache davlik". swipe right for factory reset. afterwards install rom via install button in twrp.
you will lose all appdata such as gameprogress, settings...!!!
if you want to install stable rom you have to wipe data partition in twrp. otherwise you'll have errors. thats all thats different from installing a new weekly rom.
i'd recommend to do a twrp backup of all partitions first in case you want to switch back to your current system.
Hi. you have a pretty old stable rom from 2016.
If you want to use xiaomi.eu roms you first have to unlock your bootloader officially.
i think the process is described near the bottom of this thread...
thats ok. happens after every update ;)
in the window that supersu opens try the way to not update via twrp first. for me it works in most cases and you just have to reboot once after Installation and no need to go to recovery
hi. i had no problem with just wipe cache davlik before and after flash in twrp as usual (coming from 7.3.9 on IDO)
i recommend to do a full backup in twrp anyways in case you want to go back to miui 8 or something goes wrong
hi. Thanks for miui9!
so far no bugs on Ido (redmi 3pro) coming from 7.3.9 via dirty flash.
i also tried the video app. i can't confirm app crash as some reported.
only annoying things are the new button functions (i hope that someday short press menu to open menu will be available again ;))...
hi. can you clarify what you mean? you just copy or download the rom to your phone and flash from TWRP.
going from weekly to stable factory reset (wipe data) is always necessary as it is a downgrade (not every feature from weekly will be in stable even if the stable is newer). you can do backup...