My English is very poor, I use Chinese, with the original Chinese tutorial. Use GOOGLE Translate to English to share the downgrade process. The process is very simple. I hope to help people who want to downgrade from pie to oreo without losing the DRM copyright, WIFI, Bluetooth, and Netflix SN.
Model: MI BOX 3 ( MDZ-16-AB) downgrade Android 9 Pie R2926 to Android 8 oreo R2167
Tools needed:
PC Windows 7 OS or higher, it is recommended to use the rear USB port of the computer
Download MDZ16AB.IMG firmware
https://drive.google.com/drive/folders/1-fGnIP7iLmpHUNRPhlWyEnEVHuraDc1q?usp=sharing
Download Amlogic-USB_Burning_Tool_v2.2.0
https://mega.nz/file/Hd0CmACT#OPws8xFAPOGR6SmFJKfkVQ4SXjXpetJHmZZZ7nqkRHc
Download MI BOX3 Oreo R2167 Update.zip
https://mega.nz/file/gh0xCCrR#ctdPivezVFNAuMLq19eOepO1LHJCfVNhowmZz7Fx87s
USB Male to Male cable, buy it or make it yourself.
USB flash disk-Format Fat32
--------Start----------
1. Open Amlogic-USB_Burning_Tool and click the upper left corner to load MDZ16AB.IMG firmware. After the firmware verification is completed, pay attention to the option on the right, DO NOT ERASE ALL. Uncheck Erase bootloader and keep it to'Normal erase', this is to keep DRM keys which allows Netflix to work. Once again, confirm that there is no selection error and click "Start".
2. Use a USB Male to Male cable to connect the PC and MI BOX 3 that is not powered on, and then press and hold the Bluetooth remote control hold Back+Okay, turn on the power of MI BOX 3, and enter Recovery mode.
3. On the Recovery interface, use the Bluetooth remote control, select Reboot to bootloader, press confirm, MI BOX 3 will restart, and the TV will display a gray MI LOGO interface, successfully enter the official bootloader preload certification, be careful not to disconnect USB Male to Male cable.
4. Unplug the power of MI BOX 3 again, wait for 5 to 10 seconds, press and hold the Bluetooth remote control hold Back+Okay, turn on the power of MI BOX 3, you will see the Amlogic-USB_Burning_Tool progress bar moving, from 1 % To 100%.
5. After the Amlogic-USB_Burning_Tool progress reaches 100%, click Stop and unplug the USB cable, power off and restart MI BOX 3. Then MI BOX 3 will enter the recovery cycle, don't be afraid.
6. Power off MI BOX 3, save the oreo R2167 upgrade file into a FAT32 format U disk, insert the USB port of MI BOX 3, turn on the power, it will automatically update, the update process is about 5 minutes, after the update is complete, you will Successfully fall back to Android oreo r2167. Enter Recovery mode again, Wipe clears the date and cache and restarts to complete.
For the recovery cycle, please check the tutorial:
http://www.reddit.com/r/AndroidTV/comments/97rvqg/mi_box_stuck_in_recovery_mode/e4ct7n0/
This method may help restore the mirror image of the mi box that can enter the Recovery mode and become a brick. For example, Amlogic-USB_Burning_Tool displays a 1% Low_Power error, but it is not guaranteed.
Please download the complete img file, it cannot be damaged. Use high-quality USB cable, high-quality U disk, use computer rear USB interface
Model: MI BOX 3 ( MDZ-16-AB) downgrade Android 9 Pie R2926 to Android 8 oreo R2167
Tools needed:
PC Windows 7 OS or higher, it is recommended to use the rear USB port of the computer
Download MDZ16AB.IMG firmware
https://drive.google.com/drive/folders/1-fGnIP7iLmpHUNRPhlWyEnEVHuraDc1q?usp=sharing
Download Amlogic-USB_Burning_Tool_v2.2.0
https://mega.nz/file/Hd0CmACT#OPws8xFAPOGR6SmFJKfkVQ4SXjXpetJHmZZZ7nqkRHc
Download MI BOX3 Oreo R2167 Update.zip
https://mega.nz/file/gh0xCCrR#ctdPivezVFNAuMLq19eOepO1LHJCfVNhowmZz7Fx87s
USB Male to Male cable, buy it or make it yourself.
USB flash disk-Format Fat32
--------Start----------
1. Open Amlogic-USB_Burning_Tool and click the upper left corner to load MDZ16AB.IMG firmware. After the firmware verification is completed, pay attention to the option on the right, DO NOT ERASE ALL. Uncheck Erase bootloader and keep it to'Normal erase', this is to keep DRM keys which allows Netflix to work. Once again, confirm that there is no selection error and click "Start".


2. Use a USB Male to Male cable to connect the PC and MI BOX 3 that is not powered on, and then press and hold the Bluetooth remote control hold Back+Okay, turn on the power of MI BOX 3, and enter Recovery mode.

3. On the Recovery interface, use the Bluetooth remote control, select Reboot to bootloader, press confirm, MI BOX 3 will restart, and the TV will display a gray MI LOGO interface, successfully enter the official bootloader preload certification, be careful not to disconnect USB Male to Male cable.

4. Unplug the power of MI BOX 3 again, wait for 5 to 10 seconds, press and hold the Bluetooth remote control hold Back+Okay, turn on the power of MI BOX 3, you will see the Amlogic-USB_Burning_Tool progress bar moving, from 1 % To 100%.




5. After the Amlogic-USB_Burning_Tool progress reaches 100%, click Stop and unplug the USB cable, power off and restart MI BOX 3. Then MI BOX 3 will enter the recovery cycle, don't be afraid.

6. Power off MI BOX 3, save the oreo R2167 upgrade file into a FAT32 format U disk, insert the USB port of MI BOX 3, turn on the power, it will automatically update, the update process is about 5 minutes, after the update is complete, you will Successfully fall back to Android oreo r2167. Enter Recovery mode again, Wipe clears the date and cache and restarts to complete.



For the recovery cycle, please check the tutorial:
http://www.reddit.com/r/AndroidTV/comments/97rvqg/mi_box_stuck_in_recovery_mode/e4ct7n0/
This method may help restore the mirror image of the mi box that can enter the Recovery mode and become a brick. For example, Amlogic-USB_Burning_Tool displays a 1% Low_Power error, but it is not guaranteed.
Please download the complete img file, it cannot be damaged. Use high-quality USB cable, high-quality U disk, use computer rear USB interface
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