Why the script l4t_generate_ota_package.sh in ota_tools_R36.5.0_aarch64.tbz2 not support BSP R36-5?

I found that the script l4t_generate_ota_package.sh in ota_tools_R36.5.0_aarch64.tbz2 does not support BSP R36-5. How can I perform Image-Based Over-the-Air Update based on BSP 36.5?