How to Get MIUI ROM Back From Treble ROM

The cleanest and easiest way to return to MIUI from a custom Treble ROM is to flash a full fastboot MIUI ROM, using the Mi Flash tool. This method should be used in preference to any other method (just ensure that you do not accidentally lock your bootloader again - else, there will be tears). Note that this method will probably format your storage and replace the custom recovery with the stock MIUI recovery. It is generally a good thing to allow your data to be formatted during the flashing of MIUI (so better first backup your apps and settings and data to an external storage device), because this is the best guarantee of trouble-free MIUI. You will subsequently need to flash OrangeFox again using the method described in How to Install Orangefox From Stock MIUI Recovery.

If you choose to not use method of restoring MIUI that has just been described above, then see the instructions below:

• A. Treble ROMs on many older devices use MIUI’s “cust” partition for their vendor image. This process removes the Xiaomi proprietary files that are necessary for MIUI to run. These files must be restored, otherwise MIUI will not work properly. This is not required for devices that have a dedicated vendor partition (ie, those that shipped with a full Treble ROM).
• B. For older devices (eg, kenzo, mido, vince) where the cust partition is also used for the treble ROMs' vendor partitions, if you did not create a backup of your MIUI cust partition to MicroSD or USB-OTG before installing a Treble ROM, then you must use the method just described above (ie, flash a full fastboot MIUI ROM, using the Mi Flash tool.)
• C. If you DID create a backup of your MIUI cust partition on these old devices (in the newest versions of OrangeFox, this would be the “vendor” partition – it points to the same location as “cust”) to MicroSD or USB-OTG, then you can use OrangeFox to install MIUI when coming from a Treble ROM.

Take The Following Steps:

1. Backup your internal memory to an external device (eg, MicroSD, USB-OTG, or your PC). DO NOT SKIP THIS STEP!
2. Copy the latest stable MIUI ROM to your MicroSD or USB-OTG storage
3. Boot OrangeFox
4. Make sure that OrangeFox can read your MicroSD or USB-OTG storage, and can see the MIUI ROM that you copied there. This is the ROM that you will install in the steps below.
5. Select the “Wipe” menu and wipe the Dalvik/Art Cache and Cache partitions
6. Format data (“format” - not “wipe”) - you will lose all the contents of your internal memory after doing this
7. Reboot OrangeFox - you might see a message saying “No OS installed …” - just swipe to reboot OrangeFox
8. Flash your MIUI ROM
9. Reboot to system, and wait for a long time ...
10. When ready, restore your backup of your internal memory from your external storage device.

WARNING!
Your warranty is now void.
We're not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because the alarm app failed.
Please do some research if you have any concerns about features included in this ROM/Recovery before flashing it!
YOU are choosing to make these modifications, and if you point the finger at us for messing up your device, we will laugh at you.

Useful Link:
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