I know lot of us have been waiting for official MiUi 12 release (no record of bugs so far, will update this thread if this will be the case) 
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HOW TO INSTALL STEPS :
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1- Check if you are in MiUi version 11.0.9.0 in setting -> about phone.
1.1- Download the corresponding file (link is below)
2- If yes, head to settings -> about phone -> update system.
3- Click on MiUi logo many times in rapid pattern until you unlock additional features.
4- Click on the three dots in upper right corner then select "choose update package"
5- Make sure the battery still have sufficient power for the update process, also be sure that you'll have no use for the device for the next few minutes (update installation period)
5- Select the downloaded file. and let the device do the rest (It highly advisable to avoid interfering while the device is updating itself)
---Links are below ▼▼▼---
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OTA Apply for V11.0.9.0
https://bigota.d.miui.com/V12.0.1.0...QJCMIXM-V12.0.1.0.QJCMIXM-62506d52bd-10.0.zip
You can also flash the whole MiUi 12 ROM in recovery menu without needing to be in version 11.0.9.0 :
https://bigota.d.miui.com/V12.0.1.0...TGlobal_V12.0.1.0.QJCMIXM_0698fe5654_10.0.zip
.
HOW TO INSTALL STEPS :
.
1- Check if you are in MiUi version 11.0.9.0 in setting -> about phone.
1.1- Download the corresponding file (link is below)
2- If yes, head to settings -> about phone -> update system.
3- Click on MiUi logo many times in rapid pattern until you unlock additional features.
4- Click on the three dots in upper right corner then select "choose update package"
5- Make sure the battery still have sufficient power for the update process, also be sure that you'll have no use for the device for the next few minutes (update installation period)
5- Select the downloaded file. and let the device do the rest (It highly advisable to avoid interfering while the device is updating itself)
---Links are below ▼▼▼---
.
OTA Apply for V11.0.9.0
https://bigota.d.miui.com/V12.0.1.0...QJCMIXM-V12.0.1.0.QJCMIXM-62506d52bd-10.0.zip
You can also flash the whole MiUi 12 ROM in recovery menu without needing to be in version 11.0.9.0 :
https://bigota.d.miui.com/V12.0.1.0...TGlobal_V12.0.1.0.QJCMIXM_0698fe5654_10.0.zip
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