Pre-requisite:

1️⃣ usb debugging

2️⃣ oem unlock
Download Magisk from Github and copy to OnePlus

 adb install ~/Downloads/Magisk-v27.0.apk

 ~/greg_tool$ adb push boot.img /sdcard/Download/

Patch the boot.img using Magisk App on OnePlus and then copy it back to mac

adb pull /storage/emulated/0/Download/magisk_patched-27000_jIOMG.img

Reboot

adb reboot bootloader

Reboot to fastbootd

fastboot reboot fastboot

Flash the copied modified .img

fastboot flash boot magisk_patched-27000_jIOMG.img

Reboot

fastboot reboot

Notes:

1. You only need to modify the boot.img ✅ via Magisk

2. No need to modify any other file ❌

3. If in case you are stuck at the screen with starting animation for more than 5 minutes, you probably need to flash the stock ROM as something might have gone wrong. Check this - https://manish123.stck.me/post/331186/Getting-back-to-stock-ROM-on-OnePlus-Nord-CE3-Lite

4. This has been tested on my CPH2467 (Ind) variant

   👋