IMPORTANT NOTICE --> UNLOCKING AND ROOTING MAY VOID YOUR PHONE WARRANTY AND MAY BRICK YOUR DEVICE AS WELL. I'M NOT RESPONSIBLE FOR EITHER OF THAT.
Here is a reasonable guide to get you started on unlocking and rooting Poco F1 --> https://forum.xda-developers.com/poco-f1/how-to/xiaomi-poco-f1-unlock-bootloader-custom-t3839405
Just for the records I downloaded and installed following external packages to unlock and root my device-->
Also Dont forget to take a backup of your images from TWRP and copy them to your Host machine. It will come very handy. Believe me :)
mkdir aosp-repo cd aosp-repo repo init -u https://android.googlesource.com/platform/manifest -b master git clone git@github.com:pundiramit/android-local-manifests.git .repo/local_manifests -b master repo sync -j$nproc source build/envsetup.sh lunch beryllium-userdebug make -j$nproc
NOTE: To get display working on PocoF1, we need supported Adreno firmware binaries, otherwise PocoF1 will not boot to UI.
Adreno binaries are shipped with non-distributable license,
hence I'm not shipping them in my build setup. You can
extract Adreno a630_* firmware binaries from a working
device build. I extracted mine from
lineage-16.0-20190612-nightly-beryllium-signed.zip ;)
Then copy the binaries to out vendor directory
i.e. out/target/product/beryllium/vendor/firmware,
and run "make -j$nproc" to create vendor.img again.
fastboot flash system system.img fastboot flash vendor vendor.img fastboot flash userdata userdata.img fastboot flash boot boot.img fastboot reboot
mkdir kernel-repo cd kernel-repo repo init -u https://android.googlesource.com/kernel/manifest -b common-android-mainline git clone git@github.com:pundiramit/android-local-manifests.git .repo/local_manifests -b kernel repo sync -j$nproc BUILD_CONFIG=beryllium/build.config.beryllium ./build/build.sh
cd aosp-repo source build/envsetup.sh lunch beryllium-userdebug make TARGET_KERNEL_USE=mainline -j$nproc
Now reflash the images as above and boot with your custom kernel.
NOTE:
By default the above instructions will sync/download beryllium-android-mainline branch to kernel-repo/beryllium directory. If you want to reproduce android12-5.4 or GKI build then checkout common-android12-5.4 repo manifest and beryllium-android-5.4 branch instead.