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[Android] Upgrading LineageOS 17.1 to 18.1 on my Xiaomi Mi 8 (dipper)

Install the Android Debug Bridge (ADB)


# check if device is found
adb devices
# reboot into sideload modus
adb reboot sideload

Or manually boot into TWRP recovery, holding Volume Up + Power when the phone is off. Navigate to Advanced-> ADB Sideload.

Update MIUI Firmware

Following the docs, I first had to check the Firmware version. I was running V12.0.2.0.QEAMIXM, but V12.0.3.0.QEAMIXM is required.
Download the right MIUI Firmware for your device from https://xiaomifirmwareupdater.com/firmware/dipper/.
Flash the new Firmware via TWRP or via ADB sideload.

adb sideload Downloads/fw_dipper_miui_MI8Global_V12.0.3.0.QEAMIXM_7619340f8c_10.0.zip 

Download and flash new LineageOS image

I’m using the LineageOS fork LineageOS for microG. Download it from here: https://download.lineage.microg.org/dipper/ (MI 8 = dipper)
The upgrade steps are the same as for the official rom: https://wiki.lineageos.org/devices/dipper/upgrade. In my case only flashing the new image.

adb sideload Downloads/lineage-18.1-20220602-microG-dipper.zip 

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