please do these steps in a vm or a seperate pc that you dont mind wiping if you dont trust the needed programs to keep your system stable

I'm using arch Linux in these steps, keep in mind that the steps might be more cumbersome on other distros on account of not having an aur helper

important: if edl-git does not work on arch, you can download the liveiso from the edl repo and extract and upload the files from there

1.

Install edl-git through yay (more reliable than going through the manual python setup for edl)

yay -S edl-git

2.

Boot the phone into edl mode (from off state hold star + hash and insert usb cable)

3.

# just the boot partition
edl r boot boot.img

# for exploration you can get the entire flash with
edl rf flashdump.img
# this dump can be mounted in kde with Disk Image Mounter,
# exposing the "persist, cache, modem, system and data" partitions for exploration in your file manager of choice

4.

Copy boot.img to a preferably empty project directory

5.

Install abootimg:

yay -S abootimg

6.

Download adbd,bootpatch.sh,slua and sluac from https://gitlab.com/suborg/8k-boot-patcher

7.

Go through bootpatch.sh (manual if you prefer or want to explore the extracted files)

EARLYBOOT_FILE=init.qcom.early_boot.sh 
was omitted from the script here for copy paste friendliness.
Usage of $(EARLYBOOT_FILE) was replaced with init.qcom.early_boot.sh

bootpatch.sh:

#!/bin/sh
# assume we have image dir mounted to /image and image/boot.img present
cd /image
cp boot.img boot-orig.img
echo 'Boot image found, patching...'
abootimg -x boot.img
mkdir initrd
cd initrd
cat ../initrd.img | gunzip | cpio -vid
# initrd root patch process start
cp /home/8k/adbd ./sbin/
cp /home/8k/slua ./sbin/
cp /home/8k/sluac ./sbin/
sed -i 's/ro\.secure.*/ro.secure=0/' ./default.prop
sed -i 's/ro\.debuggable.*/ro.debuggable=1/' ./default.prop
sed -i 's/.*perf_harden.*/security.perf_harden=0/' ./default.prop
sed -i '/.*reload_policy.*/d' ./init.rc
echo 'setenforce 0' >> ./init.qcom.early_boot.sh
echo 'echo -n 1 > /data/enforce' >> ./init.qcom.early_boot.sh
echo 'mount -o bind /data/enforce /sys/fs/selinux/enforce' >> ./init.qcom.early_boot.sh
# initrd root patch process end
find . | cpio --create --format='newc' | gzip > ../myinitrd.img
cd ..
# bootimg.cfg patch process start
sed -i 's/^cmdline.*/& androidboot.selinux=permissive enforcing=0/' bootimg.cfg
# bootimg.cfg patch process end
abootimg -u boot.img -f bootimg.cfg -r myinitrd.img
rm -rf *initrd* bootimg.cfg zImage
echo 'Boot image patched!'
# ...Nothing can stop an idea whose time has come

8.

Upload the created boot.img with

edl w boot boot.img

9.

reboot to OS with

edl reset

10.

(after enabling debug mode with *#*#33284#*#*) you should have a root shell with adb shell now:

user@localpc ~> adb shell
* daemon not running; starting now at tcp:5037
* daemon started successfully
root@Nokia 6300 4G:/ # whoami
root
root@Nokia 6300 4G:/ #

should you encounter any errors with the setup itself and have feedback regarding this tutorial, please let me know how to improve it (besides making it NOT arch linux dependant)