How to create OTA zip and and update OTA zip file into target device

Hi,
I am working on “ROCK PI 4 Model B+” with Android 11.
Cloned and compiled source code from using this (https://wiki.radxa.com/Rockpi4/rockpi-android11) link.
All images are generated in “rockdev” directory.
Now I am trying to generate OTA zip file and update into target device.
Can you please help me to generate OTA zip(Major & Minor) file and update procedure or steps for “ROCK PI 4 Model B+” with Android 11.

Thank you.