Enable developer options and then OEM unlocking.
Unlock bootloader. This will erase all data on the device.
fastboot flashing unlock
fastboot flashing unlock_critical
Disable developer options.
Click OTA IMAGES on matching device model and firmware. Download the image-boot file which includes init_boot.img.
Feed init_boot.img file to KernelSU app.
Or, to do it on a Linux X86_64 computer, download magiskboot-linux and ksud-x86_64-unknown-linux-musl.
./ksud-x86_64-unknown-linux-musl boot-patch -b extracted/init_boot.img --magiskboot magiskboot-linux-main/x86_64/magiskboot --kmi android14-6.1
The --kmi value depends on the current firmware version. The value can be put together by checking the kernel version.
./magiskboot-linux-main/x86_64/magiskboot unpack extracted/boot.img && \\
strings kernel | grep "Linux version"
./ksud-x86_64-unknown-linux-musl boot-info supported-kmis
Flash the patched image.
fastboot flash init_boot ./kernelsu_patched.img
Download the zip file of the full OTA of the available firmware shown on the OTA update.
On KernelSU, go to settings and press uninstall. Choose "Restore stock image". After the process is complete, do not reboot.
Put the full OTA zip file to /sdcard/ota/. Dial *#*#682#*#*. Start the OTA installation. After the OTA installation is complete, press cancel to the restart prompt.
Go to KernelSU and install to inactive slot. Press reboot.
Enable developer options and then USB debugging, and plug in the phone to the computer.
Install LeMobile - Android ADB Interface driver from Windows Updates from optional updates.
Enable Qualcomm diagnostics port.
sudo setprop sys.usb.config diag