Blog Abimayu: Flash Mi5 with lineage OS

For this process, you will need to:

=== download ===

http://en.miui.com/thread-3699399-1-1.html

miui : 8.8.30 : http://bigota.d.miui.com/8.8.30/gemini_global_images_8.8.30_20180830.0000.00_8.0_global_dda9b3fc14.tgz

gapps : https://opengapps.org/?arch=arm64&api=8.1&variant=micro

lineageOS : https://download.lineageos.org/gemini

TWRP :  https://dl.twrp.me/gemini/

MI unlocktools : https://forum.xda-developers.com/android/software-hacking/tool-miunlocktool-unlock-bootloader-t3782444/page6

=== steep ===

1. unlock bootloader first

   - create Mi Account

   - request unlock

2. add mi account to smartphone

3. wait 72 hourss for response from Xiaomi

 if you can't wait 72 hours

4. after 72 hours, then use Mi unlocktools  ( on fastboot mode : Vol up + power )

   # java -jar MiUnlockTool.jar

or

   # java -jar MiUnlockTool.jar  'email@gmail.com' 'pasword'

5. Flash MIUI 8.8.30

   - extract tgz files

    # cd gemini_global_images_8.8.30_20180830.0000.00_8.0_global

    # bash flash_all_except_storage.sh

6. Flash TWRP

    # fastboot flash recovery  twrpXXXX.img

7. Access recovery

   - wipe cache , dalvik, user, data

   - install lineageOS-xxxx.zip

   - install gapps-xxx.zip

Done

source : https://forum.xda-developers.com/mi-5/development/rom-lineageos-15-0-xiaomi-mi-5-t3669247

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