Howto Upgrade LineageOS From 20.0 to 21
This time LinageOS has no .0, only 21 - https://lineageos.org/Changelog-28/, in the end everything went pretty smooth.
As Android has moved onto the quarterly maintenance release model, this release will be “LineageOS 21”, not 21.0 or 21.1 - though worry not - we are based on the latest and greatest Android 14 version, QPR1.
Honestly I never understood the versioning and never cared that much.
See previous parts if you have an older version:
- upgrading from 17.1 to 18.1
- upgrading from 18.1 to 19.1
- upgrading from 19.1 to 20.0 - if you need details about Android tools setup, upgrade firmware, boot, read this one
Preparation
I still had working adb and fastboot from the last time.
Upgrade Lineage
I followed the offical upgrade guide https://wiki.lineageos.org/devices/xz2c/upgrade/.
- download from https://download.lineageos.org/devices/xz2c/builds
adb -d reboot sideloadadb -d sideload ~/lineage-21.0-20240524-nightly-xz2c-signed.zip
Here this reboot sideload didn’t work for me as I got rebooted to the recovery, but couldn’t sideload anything:
$ adb -d sideload ~/lineage-21.0-20240524-nightly-xz2c-signed.zip
adb: sideload connection failed: no devices found
adb: trying pre-KitKat sideload method...
adb: pre-KitKat sideload connection failed: no devices found
but I saw the device:
$ adb devices
List of devices attached
BH902KDKCU recovery
I had to go to Advanced -> Reboot to recovery. And then after the restart Apply update -> Apply from ADB.
$ adb sideload ~/lineage-21.0-20240524-nightly-xz2c-signed.zip
Total xfer: 1.00x
And then I also flashed boot, because why not:
$ fastboot flash boot ~/boot.img
Sending 'boot_b' (65536 KB) OKAY [ 0.259s]
Writing 'boot_b' OKAY [ 1.276s]
Finished. Total time: 1.554s
$ fastboot reboot
Rebooting OKAY [ 0.000s]
Finished. Total time: 0.100s
And that’s all. Don’t forget to flash Gapps in the correct timing if you use some.
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