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2zqa/How to flash a ROM on Mi 9T.md

Created April 29, 2020 17:06
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How to flash a ROM on Mi 9T.md

Flashing a ROM on Mi 9T from start to end

TLDR

If you've flashed a ROM before, it's exactly the same. Unlock the device, flash TWRP, install ROM. Exceptions:

  • Make sure to securely backup EFS using the TWRP backup function and persist.img using adb shell dd if=/dev/block/bootdevice/by-name/persist of=/sdcard/persist.img while you are still in TWRP.
  • Unlocking your device requires a Mi Account. You can find instructions on how to do this in developer settings.
  • You may get stuck in recovery until you format data when you try to boot into your ROM after flashing.
  • Read the full instructions to know when to wipe

Prerequisites

  1. Android Platform Tools (for ADB and fastboot): https://developer.android.com/studio/releases/platform-tools
  2. TWRP img file, your ROM zip, and optionally gapps and/or magisk

Unlocking device

  1. Create and login with a Mi Account, and enable find device and add phone number (AFAIK, might need more steps)
  2. Enable developer options by going to About phone and tapping the MIUI-version 7 times
  3. Go to additional settings -> developer settings -> enable OEM unlocking and go to Mi unlock status, register for unlocking
  4. Wait a week. To check how long you have to wait, continue following these steps.
  5. Download and run the latest xiaomi flash tool

Flashing

  1. Reboot to bootloader (for fastboot): adb reboot bootloader
  2. run fastboot flash recovery recovery.img
  3. Press and hold volume up & power until you see the TWRP logo
  4. If prompted, enter your password
  5. backup persist.img: adb shell dd if=/dev/block/bootdevice/by-name/persist of=/sdcard/persist.img
  6. then retrieve the file from your phone using adb pull /sdcard/persist.img. important: back up this persist.img file, preferably on two or more locations!
  7. Backup EFS: on your phone, tap backup and only select EFS. Backing up other parts is optional.
  8. Retrieve the EFS backup: adb pull /sdcard/TWRP
  9. Tap wipe on your phone and swipe to factory reset
  10. Start sideload: adb shell twrp sideload
  11. Sideload ROM: adb sideload <your ROM zip file>, for example: adb sideload lineageOS.zip
  12. Optionally: install magisk and/or gapps.
  13. Go to wipe, tap format data and type 'yes'
  14. Run adb reboot to boot to your new ROM.
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