How to install dualpi2 qdisc on the rpi (router) to simulate congestion to test L4S

https://github.com/L4STeam/linux/

I tried installing the qdisc dualpi2 from the above link following the steps given in the Readme file onto the Raspberry pi 4 B

At first I get the error: Couldn't find DTB bcm2711-rpi-4-b.dtb on the following paths: /etc/flash-kernel/dtbs /usr/lib/linux-image-5.15.72+ /lib/firmware/5.15.72+/device-tree/

I copied the file generated in the arch folder to the following locations, and run

1. make modules_install
2. make install

For make install, i get "out of memory" error

I tried following the steps mentioned below

1. cd ~
2. mkdir initramfs
3. cd initramfs
4. sudo cp -a /boot .
5. cd boot
6. sudo update-initramfs -ut -b .
7. sudo cp -a * /boot
8. sudo apt-get autoremove

Step 6 gives out of memory error.

How do I fix the same?